44th Period: Survival Class — Class 1-4 character dossier

Scope: Students of Seono High School, Year 1, Class 4 only. No other classes, teachers or outside characters.

I'll distinguish between established character traits and behavioural interpretations. The focus is not just what each student looks like, but who they are under pressure, how they function in ordinary circumstances, their social instincts, their survival value, and how they interact with other personalities.

The class's four initial survival groups are:

• Group A: Kim Do-yun, Choi Won-gyun, Im Seon-ah, Choi Seo-jeong.
• Group B: Kim Tae-hyun, Nam Jeong-woo, Han Su-jin, Choi Na-ri.
• Group C: Lee So-han, Oh Seung-jae, Kim Ji-eun, Im I-ji.
• Group D: Jeon Seok-oh, Seo Ye-rim, Choi Yeon-jun, Yang So-hyeon.

Group A — Observation, emotional steadiness and interpersonal friction

1. Kim Do-yun (김도윤)

Analytical / Adaptive survivor

• Role: Main protagonist; one of the principal investigators of the black circle's rules.
• Appearance: Ordinary-looking male student; carries himself more like an observant student than a conventional action hero.
• Normal behaviour: Likes documenting things and has maintained a diary for a year. Observant, curious and attentive to details that other people might overlook.
• Under danger: Quick-thinking, resourceful and unusually capable of converting observations into practical survival strategies. Identifies the Decalcomania Monster's sensitivity to sound and exploits it.
• Decision-making: Evidence-oriented. Rather than simply reacting to a threat, he tries to understand its conditions and limitations.
• Emotional response: Can be frightened, but fear does not necessarily prevent him from thinking.
• Toward others: Generally cooperative. Will work with people rather than insist on being the sole authority.
• Group behaviour: Functions as an investigator and problem-solver. His value comes from interpreting information and turning it into actionable plans.
• Weaknesses: His tendency to investigate unfamiliar phenomena can expose him to danger. Being intelligent does not mean he has complete information.
• Personality in one line: An ordinary student whose greatest survival weapon is his ability to notice, connect and improvise.

2. Choi Won-gyun (최원균)

Protective / Emotionally expressive

• Role: Do-yun's close friend and one of his most reliable companions.
• Appearance: Tall, broad and slightly chubby; gentle, approachable appearance. Carries a bass guitar case and belongs to the band club.
• Normal behaviour: Comedic, friendly, soft-hearted and socially approachable. Has a more visibly expressive personality than the analytical Do-yun.
• Under danger: Easily frightened and prone to panic. His first reaction is not necessarily calculated or courageous.
• Protective instinct: Despite being scared, he is capable of putting himself in danger to protect others.
• Toward Do-yun: Close friendship and trust. Their contrasting temperaments complement each other.
• Toward others: Generally approachable rather than intimidating. His appearance and manner make him seem non-threatening.
• Group behaviour: Provides physical support and emotional companionship. He is not simply the group's comic relief.
• Weaknesses: Panic can interfere with his ability to assess a situation independently.
• Personality in one line: A frightened but fundamentally dependable friend whose willingness to help matters more than his confidence.

3. Im Seon-ah (임선아)

Gentle / Meticulous / Composed under pressure

• Appearance: Long, wavy, light-brown hair, golden eyes and a distinctive yellow cardigan.
• Normal behaviour: Kind, affectionate, gentle and emotionally expressive.
• Emotional disposition: A crybaby; she is easily moved to tears and visibly experiences fear.
• Under danger: An interesting contrast: despite her tendency to cry, she can remain remarkably calm during actual exploration. Follows established rules instead of acting recklessly.
• Decision-making: Careful and detail-oriented. Records unusual observations on maps, preserving information for the group.
• Toward others: Warm and considerate. Her gentleness does not mean she is incapable of functioning independently.
• Group behaviour: The recorder and meticulous observer. Her documentation complements Do-yun's analytical thinking.
• Strength: Can separate emotional distress from the practical task at hand.
• Weakness: Her sensitivity makes her visibly vulnerable to distress, even when she remains operational.
• Personality in one line: Emotionally fragile on the surface, surprisingly disciplined when survival requires it.

4. Choi Seo-jeong (최서정)

Socially difficult / Paranoid

• Appearance: Brown bobbed hair and a slightly chubby build.
• Normal behaviour: Paranoid and socially difficult. Has a poor reputation among her classmates and is among the least socially popular students in the class.
• Interpersonal behaviour: Her suspicious disposition makes ordinary cooperation difficult.
• Under danger: Her paranoia is particularly relevant in a survival environment: heightened suspicion can make it difficult to distinguish genuine threats from harmless uncertainty.
• Toward others: Her relationships are strained; she does not occupy the same naturally trusted position as Do-yun or Won-gyun.
• Group behaviour: Her presence introduces interpersonal friction into Group A. Cooperation with her requires more than simply sharing a common objective.
• Important distinction: Paranoia should not automatically be interpreted as cowardice, malice or stupidity. These are different characteristics.
• Personality in one line: A socially isolated, suspicious student whose greatest obstacle may be interpersonal trust.

Group B — Leadership, confrontation and assertiveness

5. Kim Tae-hyun (김태현)

Physically imposing / Assertive

• Appearance: Blond hair slicked back, red eyes, tall build; wears a cast on his right arm and gym clothes instead of the usual uniform.
• Physical profile: Approximately 180 cm; one of the tallest students in the class.
• Normal behaviour: His appearance is more intimidating than that of an average student. The cast suggests a pre-existing injury, rather than an injury caused by the black circle.
• Under danger: Has considerable experience encountering the monsters, partly because of his position in Group B and the group's activities.
• Physical limitations: His injured right arm is an important practical disadvantage. His imposing build should not be confused with unrestricted physical capability.
• Toward others: His interactions are less comprehensively established in the available character descriptions, so I wouldn't assign him a definite social temperament without more evidence.
• Group behaviour: One of the students with substantial exposure to the survival environment.
• Personality in one line: A physically imposing student whose injury complicates the advantages his build might otherwise provide.

6. Nam Jeong-woo (남정우)

Intellectual / Benevolent leader

• Role: Class president of 1-4. (class monitor)
• Normal behaviour: Responsible, considerate and accustomed to taking responsibility for the class.
• Leadership style: Benevolent rather than authoritarian. He does not primarily lead through intimidation or commanding others.
• Under danger: Takes over leadership following the homeroom teacher's death. Possesses excellent reasoning and deduction abilities.
• Decision-making: Rational and analytical. His class-president role also means he has considerable exposure to the survival situation.
• Emotional response: His apparent composure conceals psychological vulnerability. He blames himself for Seo Ye-rim's death.
• Toward others: Kind and generally considerate of classmates. His leadership is rooted in responsibility towards them.
• Group behaviour: Acts as a coordinator and stabilising authority. He is not necessarily the most forceful personality in the room.
• Weakness: Guilt and excessive responsibility can undermine his mental stability.
• Personality in one line: A compassionate intellectual leader who can reason through danger but struggles with the emotional weight of responsibility.

7. Han Su-jin (한수진)

Strong-willed / Protective / Confrontational

• Appearance: Reddish-brown bobbed hair, red eyes and a sharp, handsome appearance. Second-tallest among the female students.
• Normal behaviour: Strong-willed, intimidating and assertive. Does not easily submit to other people's authority.
• Interpersonal behaviour: Blunt and confrontational. Will openly challenge people, including the delinquent Jeon Seok-oh.
• Under danger: Demonstrates courage through action. Risks her own life to save Oh Seung-jae.
• Emotional complexity: Her intimidating exterior is not an indication of a lack of empathy.
• Toward others: Can be hostile when provoked, but also recognises when she has acted rashly and apologises sincerely.
• Toward Seung-jae: Saves him, although her intimidating appearance initially makes him afraid of her.
• Toward Yeon-jun: Apologises to him for her rash behaviour.
• Group behaviour: A strong-willed, action-oriented member who is unlikely to remain passive when confronted with danger or injustice.
• Weakness: Impulsiveness and a confrontational approach can create unnecessary interpersonal conflict.
• Personality in one line: An intimidating, outspoken protector whose aggressive exterior conceals a strong moral and emotional core.

8. Choi Na-ri (최나리)

Limited character information

• Appearance: Shortest female student in the class; recognisable by her thick eyebrows.
• Clothing: Distinctive for wearing both gym shorts and a gym top, unlike Tae-hyun, who wears gym clothes only on his upper body.
• Normal behaviour: Her everyday temperament and social relationships are not sufficiently established in the sources I could verify.
• Under danger: I would avoid labelling her brave, cowardly, passive or aggressive without specific behavioural evidence.
• Group behaviour: Member of Group B alongside Tae-hyun, Jeong-woo and Su-jin.
• Personality in one line: A visually identifiable Group B member whose psychological profile needs more direct textual evidence.

Group C — Emotional restraint, impulsivity and observation

9. Lee So-han (이소한)

Stoic / Rational / Reserved

• Appearance: Black hair, grey hoodie; shortest male student in the class.
• Normal behaviour: Extremely reserved. Rarely speaks more than necessary and generally responds in short sentences.
• Emotional expression: Maintains an almost expressionless face even in critical situations.
• Under danger: Rational, composed and capable of making judgments without visibly succumbing to panic.
• Decision-making: Appears to prioritise logic and relevant information over emotional reactions.
• Toward others: Not particularly expressive or socially demonstrative. His quietness should not automatically be interpreted as hostility.
• Group behaviour: A low-profile member who can contribute without dominating conversations.
• Weakness: His lack of communication and emotional transparency can make it difficult for others to understand him.
• Personality in one line: An emotionally unreadable, economical communicator whose composure makes him difficult to destabilise.

10. Oh Seung-jae (오승재)

Impulsive / Physically imposing

• Appearance: Brown hair, thick eyebrows; tallest and largest male student in the class, approximately 180 cm.
• Normal behaviour: Initially appears to be an ordinary student, neither particularly studious nor delinquent. Seen sleeping during the end-of-day roll call.
• Under danger: Impulsive. His actions frequently precede his thoughts, especially in threatening situations.
• Decision-making: More instinctive than analytical. He may act before fully understanding the consequences.
• Toward others: His interactions with Su-jin reveal that he can be intimidated by people with forceful personalities.
• Toward Su-jin: His life is saved by her, but he struggles to thank her properly because he is afraid of her.
• Group behaviour: His physical size may be advantageous, but his impulsiveness can make him unpredictable.
• Weakness: Acting before thinking, especially when frightened.
• Personality in one line: An ordinary, physically imposing student whose instincts can be both an advantage and a liability.

11. Kim Ji-eun (김지은)

Organised / Information-oriented

• Appearance: Brown hair and glasses.
• Normal behaviour: Not enough verified information to establish her broader social personality.
• Under danger: Her documented responsibility involves map-related work.
• Decision-making: Her contribution is connected to spatial information and organising the group's understanding of its surroundings.
• Toward others: Her individual relationships and interpersonal tendencies are not sufficiently documented.
• Group behaviour: Group C's map keeper, making her role particularly useful for navigation and preserving spatial information.
• Strength: Provides a practical organisational function rather than relying on physical strength.
• Personality in one line: A map-oriented, organisational member whose practical contribution is important to group exploration.

12. Im I-ji (이미지)

Limited character information

• Appearance: Green hair and a headband; tallest female student in the class.
• Physical profile: Her height distinguishes her among the female students.
• Normal behaviour: Her broader temperament, interests and relationships are not sufficiently established by the available descriptions.
• Under danger: Avoiding unsupported assumptions is particularly important here; physical height does not establish courage or aggression.
• Group behaviour: Member of Group C with So-han, Seung-jae and Ji-eun.
• Personality in one line: A physically distinctive Group C member whose detailed behavioural profile requires more direct evidence.

Group D — Social friction, delinquency, emotional vulnerability and detachment

13. Jeon Seok-oh (전석오)

Delinquent / Aggressive / Confrontational

• Appearance: Black hair, very small pupils and an intimidating appearance. Third-tallest student in the class.
• Normal behaviour: Delinquent tendencies; engages in behaviours such as smoking and drinking.
• Interpersonal behaviour: Rough-mannered, belligerent and confrontational. Not someone who naturally inspires a sense of safety through his manner.
• Under danger: His aggressive disposition makes him less likely to respond to confrontation passively.
• Toward others: Can be difficult to cooperate with, particularly when people challenge his behaviour or authority.
• Toward Su-jin: She does not back down from him, even openly insulting him. Their interactions establish that he is not automatically able to intimidate everyone.
• Group behaviour: A potentially disruptive personality within a group that already faces considerable external danger.
• Weakness: Aggression and poor behavioural restraint can complicate collective decision-making.
• Personality in one line: A rough, intimidating delinquent whose confrontational personality makes him a potential source of internal conflict.

14. Choi Yeon-jun (최현준)

Stoic / Emotionally restrained / Observant

• Appearance: Dull purple hair, lifeless purple eyes, white-and-purple top over his uniform and a purple bag.
• Normal behaviour: Exceptionally expressionless. Rarely displays strong visible reactions.
• Emotional expression: Similar to So-han in his reserved presentation, although his individual mannerisms and relationships are distinct.
• Under danger: Usually maintains a controlled exterior. However, his composure is not absolute.
• Fear response: When the Restroom Mirror Monster imitates Seo Ye-rim, he displays visible signs of distress, including trembling pupils and profuse sweating.
• Social behaviour: Can display a lighter, more amused side; he has been seen laughing while speaking with Seok-oh.
• Toward Su-jin: Receives an apology from her following her rash behaviour.
• Group behaviour: His restrained personality makes him less outwardly disruptive, but he is not devoid of emotion.
• Weakness: His internal emotional state is difficult for others to read.
• Personality in one line: A remarkably detached-looking student whose rare emotional reactions reveal more than his usual expressionlessness.

15. Seo Ye-rim (서예림)

Timid / Fearful / Vulnerable

• Appearance: Petite build, glasses; surprisingly, she is the third-tallest female student in the class.
• Normal behaviour: Timid and emotionally vulnerable.
• Under danger: Her fear is particularly visible after witnessing the homeroom teacher's death.
• Emotional response: Frequently crying or appearing pale and frightened.
• Psychological state: The experience of witnessing a violent death places her under considerable psychological strain.
• Toward others: Her vulnerability contrasts with the more confrontational personalities in her group.
• Group behaviour: Her presence illustrates the psychological consequences of the survival situation, not merely its physical dangers.
• Important event: Her death becomes a major emotional burden for Nam Jeong-woo, who blames himself.
• Personality in one line: A timid student whose vulnerability exposes the psychological cost of surviving the black circle.

16. Yang So-hyeon (양소현)

Reserved / Under-documented

• Appearance and physical profile: Less thoroughly documented in the accessible character descriptions.
• Normal behaviour: Her personality is not sufficiently established for a confident full psychological assessment.
• Under danger: Her individual fear response and survival instincts need to be distinguished from the behaviour of the group around her.
• Social behaviour: Associated with the D-group members and later developments involving other survivors.
• Group behaviour: Part of the original Group D alongside Seok-oh, Yeon-jun and Ye-rim.
• Personality in one line: A Group D member whose individual personality deserves more evidence-based examination rather than invented traits.

Class 1-4: Collective personality dynamics

This is where the class becomes particularly interesting. The students aren't simply sixteen different personalities; their differences create different kinds of survival groups.

| Group | Main interpersonal dynamic | Main survival strengths | Main vulnerabilities | | ----- | -------------------------------------------------- | --------------------------------------------- | ------------------------------------ | | A | Cooperation and contrasting emotional temperaments | Observation, documentation, adaptability | Panic, distrust | | B | Responsibility and assertiveness | Leadership, deduction, courage | Guilt, confrontation | | C | Reserved personalities and practical roles | Composure, physical presence, organisation | Impulsiveness, limited communication | | D | Confrontation and emotional vulnerability | Individual resilience and varied temperaments | Conflict, psychological strain |

Important personality contrasts

• Do-yun vs So-han: Both rational, but Do-yun actively investigates and communicates his findings, whereas So-han is much more reserved.
• Won-gyun vs Seung-jae: Both have physical presence, but Won-gyun is emotionally expressive and protective, while Seung-jae tends to act impulsively.
• Seon-ah vs Ye-rim: Both experience fear, but Seon-ah can maintain procedural discipline during exploration, whereas Ye-rim's trauma manifests more visibly.
• Jeong-woo vs Seok-oh: Jeong-woo leads through responsibility and consideration; Seok-oh has a much more confrontational disposition.
• Su-jin vs Seo-jeong: Su-jin is outwardly assertive and confrontational, whereas Seo-jeong's documented social difficulty is associated with paranoia.
• So-han vs Yeon-jun: Both are emotionally restrained, but Yeon-jun has demonstrable moments of visible emotional disturbance.
• Do-yun vs Jeong-woo: Both possess strong reasoning abilities, but Do-yun's defining function is investigative problem-solving, while Jeong-woo carries the responsibility of class leadership.

Quick-reference character index

| Character | Dominant personality trait | | -------------- | ------------------------------------ | | Kim Do-yun | Analytical and adaptive | | Choi Won-gyun | Gentle and protective | | Im Seon-ah | Sensitive but composed | | Choi Seo-jeong | Paranoid and socially difficult | | Kim Tae-hyun | Physically imposing | | Nam Jeong-woo | Benevolent and intellectual | | Han Su-jin | Assertive and protective | | Choi Na-ri | Insufficient behavioural information | | Lee So-han | Stoic and rational | | Oh Seung-jae | Impulsive | | Kim Ji-eun | Organisational | | Im I-ji | Insufficient behavioural information | | Jeon Seok-oh | Aggressive and delinquent | | Choi Yeon-jun | Emotionally restrained | | Seo Ye-rim | Timid and vulnerable | | Yang So-hyeon | Insufficient behavioural information |

Some of the finer psychological descriptions are interpretations of documented actions, not official personality labels. I've deliberately left gaps rather than inventing personalities for students with insufficient information.

44th Period: Survival Class — Secondary character & monster dossier

SPOILERS · SEASON 1, EPISODES 1–34 · Includes the teachers, every Season 1 monster and the major environmental anomaly.

An important distinction: the monsters aren't all conventional predators. They are manifestations of distorted school rules, school folklore and familiar objects. Most have restricted territories and specific conditions governing their attacks. Their behaviour is often mechanical, but they can still be cunning within those conditions.

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1. Teachers

1. 1st Year, Class 4 — Homeroom teacher

First human casualty

• Identity: Male; name and age not established. Korean-language teacher and homeroom teacher of Class 1-4.
• Normal behaviour: Responsible and attentive to his students. Before the incident, distributes notices concerning the mysterious black circles and warns the class to exercise caution.
• During the disaster: Initially startled when the classroom is swallowed, but quickly regains his composure.
• Decision-making: Chooses to investigate the situation rather than remain uninformed. Goes into the corridor to assess the surroundings.
• Encounter with danger: Encounters the Korean Language Monster, which attacks him for being outside the classroom during class time.
• Death: Decapitated by the monster in Episode 2.
• Psychological profile: His response suggests a calm, rational and responsible adult. His fatal mistake is not simply cowardice or recklessness: he applies ordinary emergency instincts to an environment governed by supernatural rules.
• Narrative importance: His death establishes that adult authority, experience and conventional common sense offer no protection against the black circle's rules. His absence forces Nam Jeong-woo to assume leadership.

2. 2nd Year, Class 1 — Homeroom teacher

• Identity: Female; age and name unknown.
• Normal behaviour: A teacher responsible for Class 2-1.
• During the disaster: Attempts to manage the class after the black circle incident. When a seemingly official emergency broadcast instructs everyone to evacuate, she leads the students out.
• Decision-making: Trusts the school announcement and prioritises an orderly evacuation.
• Encounter with danger: Falls under the Broadcast Urban Legend Monster's hypnosis.
• Fate: Loses control of her body, repeatedly follows and recites the broadcast instructions, and leads the hypnotised students away. Her ultimate fate is not confirmed.
• Psychological profile: Her actions demonstrate conventional leadership and trust in institutional authority. Unlike the first teacher, she is not killed immediately; instead, her authority is exploited by the monster to influence the entire class.
• Narrative importance: Demonstrates that even a responsible adult can become a danger to the people they are trying to protect when the environment corrupts familiar sources of authority.

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2. Monsters — School-rule manifestations

These five monsters are associated with distorted school regulations.

3. Korean Language Monster (국어 괴물)

EP. 1 - PENERIMAAN SISWA BARU - 1 | 44th Period Survival Class

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Territory: Class 1-4 vicinity / corridors

• Origin: A short-haired, ribbon-wearing female character illustrated in a Korean-language textbook, fused with the rule prohibiting students from wandering outside the classroom during lessons.
• Appearance: Long arms, extremely sharp fingernails and a disturbing, exaggerated expression. Its appearance resembles a textbook illustration distorted into a physical creature.
• Behaviour: Aggressive towards anyone it detects wandering in the corridor during class time. It does not attack those who remain inside classrooms.
• Attack method: Uses a powerful karate-chop-like strike to decapitate its victims.
• Temperament: Strict, punitive and seemingly incapable of distinguishing an innocent mistake from a serious violation.
• Intelligence: Not shown to possess sophisticated strategic reasoning. It follows its rule with frightening consistency.
• Notable behaviour: Smiles mockingly at Do-yun and Jeong-woo while they remain inside the classroom, but cannot attack them there.
• Survival condition: Remain inside a classroom during lesson time. The distinction between being inside a classroom and wandering in a corridor is crucial.
• Narrative significance: The first monster encountered by Class 1-4. Establishes the fundamental principle that survival depends on discovering rules, not fighting monsters.

Personality shorthand: A supernatural disciplinarian. It doesn't hunt indiscriminately; it punishes violations.

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4. Decalcomania Monster (데칼코마니 괴물)

44th Period: Survival Class | WEBTOON

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Territory: School corridors

• Origin: A distorted manifestation of the art technique decalcomania, drawing and sculpting hands, combined with the rule against making noise in corridors.
• Appearance: Enormous, with a gigantic hand capable of folding walls and floors. Much of its body remains concealed behind the surrounding architecture.
• Sensory ability: Cannot seem to see its targets normally; instead, it is extraordinarily sensitive to sound.
• Behaviour: Remains hidden until it detects noise. Repeatedly vocalises something resembling "Decalcomania?" when searching for the source.
• Attack method: Folds walls and floors like sheets of paper, crushing people and transforming them into two-dimensional paintings.
• Movement: Can manipulate the environment itself, folding the floor or walls to pursue people. It is not simply a creature running after its victims.
• Temperament: Relentless once it detects a sound. Its attacks are reactive rather than based on random target selection.
• Intelligence: Primarily sensory and instinctive, but its environmental manipulation makes it exceptionally dangerous.
• Weakness: Sound can be deliberately redirected. Do-yun exploits this by throwing noisy objects, including his phone, away from the group.
• Survival condition: Remain quiet, control accidental noises and use sound diversion if necessary.
• Notable encounter: It can be drawn towards the sound of other monsters, creating dangerous interactions between otherwise separate threats.
• Narrative significance: One of the most lethal monsters in the first season, responsible for a particularly large number of deaths.

Personality shorthand: A gigantic, sound-driven hunter that turns the school itself into a weapon.

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5. Science Monster (과학 괴물)

44th Period: Survival Class : Sticker Packs – 70EastBooks

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Territory: Science laboratory vicinity

• Origin: Science laboratory equipment combined with laboratory safety regulations.
• Appearance: A towering creature made of laboratory apparatus:
  • Triangular flask for its upper body.
  • Alcohol burner for its lower body.
  • Test tubes for arms.
  • Tripods for legs.
  • Laboratory coat over its body.
• Movement: Despite its seemingly impractical construction, it can walk slowly using its tripod legs.
• Behaviour: Uses smoke and its laboratory equipment to isolate and capture victims.
• Attack method: Its test-tube arms designate and immobilise a target. It then draws the victim into its flask, where the burner melts them at extremely high temperatures.
• Aftermath: The victim is expelled in different physical forms: solid remains, gas and liquid.
• Physical capabilities: Extremely durable. It can deflect a metal-ended mop thrown at it without sustaining apparent damage.
• Sensory/environmental feature: Its smoke appears to interfere with communication, potentially absorbing or blocking sound.
• Intelligence: Not demonstrated to be conversational or particularly strategic, but its ability to immobilise and process victims makes it highly efficient.
• Survival condition: Avoid its designated experimental area and follow laboratory safety restrictions. The class's later exploration also establishes that its attack is not easily escaped through brute force.
• Narrative significance: Illustrates how familiar science equipment and safety instructions become horrifying when transformed into a monster's operating system.

Personality shorthand: A walking laboratory apparatus that treats humans as experimental material.

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6. Physical Education Monster (체육 괴물)

후라이드 지글지글 (@EunDo29729) on X

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Territory: Gymnasium

• Origin: A physical education teacher fused with the regulation that students must wear gym uniforms during PE lessons.
• Appearance: Resembles a tall, ordinary male PE teacher wearing sports clothes, but its face is obscured by shadow. Only enormous eyes and a grotesquely wide mouth are visible. Carries a red whistle.
• Physical capabilities: Exceptionally strong, athletic and fast, with disproportionately long limbs and large hands.
• Behaviour: Enforces the gym-uniform rule through extreme violence. Students without the appropriate clothing are vulnerable.
• Intelligence: Unlike some of the more instinctive monsters, it demonstrates tactical awareness. Uses gym equipment, obstacles and positioning to trap its targets.
• Attack method: Throws Ball Monsters at students and uses its whistle to coordinate their attacks.
• Temperament: Cruel, calculating and controlling. It appears to enjoy manipulating the situation rather than simply attacking immediately.
• Territorial restriction: Operates within the gymnasium and does not appear to leave it.
• Weakness: Understanding the uniform rule and finding a way to satisfy it. However, merely wearing gym clothes does not make the gymnasium safe from every possible attack.
• Important encounter: Uses its whistle to trigger mass attacks by the Ball Monsters against Group B. It also exploits the group's attempts to rescue one another.
• Narrative significance: One of the most strategically dangerous monsters because it combines physical strength with environmental control and subordinate creatures.

Personality shorthand: A sadistic PE instructor who turns a school uniform requirement into an execution mechanism.

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7. Ball Monsters / My Ball Monsters (공 괴물)

44th Period: Survival Class : Sticker Packs – 70EastBooks

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Territory: Gymnasium and corridors

• Origin: Students transformed by the Physical Education Monster. Their heads become grotesque sports balls.
• Appearance: Footballs, basketballs and volleyballs with distorted human facial features. Some have teeth, hair and stitched-looking details.
• Behaviour: Initially, they repeatedly shout phrases such as "Pass!" and "My ball!" without necessarily attacking anyone.
• Trigger: Their aggression is activated when the PE Monster throws them or blows its whistle.
• Attack method: Charge at and bite people who are not wearing gym uniforms.
• Transformation: Once a victim is bitten, the PE Monster can designate them with its whistle. The victim's head gradually transforms into another Ball Monster, after which the PE Monster removes the head.
• Psychological horror: They are not necessarily mindless from the moment of transformation. Some appear to retain human consciousness and distress before being activated.
• Relationship with the PE Monster: Function as its subordinate attackers. They respond to its signals and extend its ability to attack multiple people.
• Temperament: Not independently aggressive all the time. Their behaviour is conditional and controlled by the PE Monster.
• Weakness: Their attacks can be avoided or intercepted, but their numbers and the PE Monster's coordination make this difficult.
• Narrative significance: One of the most disturbing monster concepts because the creatures are not simply transformed objects: they are former students.

Personality shorthand: Victims converted into controllable weapons, retaining traces of their humanity.

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8. Infirmary Monster (보건실 괴물)

44th Period: Survival Class by SangC | The StoryGraph

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Territory: Infirmary

• Origin: A distorted combination of infirmary-use regulations, health posters, medical treatment and mummy imagery.
• Appearance: Tall female nurse-like figure wearing a white medical coat and white mask. Has long arms, brownish hair and distinctive oval eyes.
• Sensory signature: Associated with a peculiar smell of blood mixed with disinfectant.
• Environment: Its infirmary is transformed into a massive maze of beds and curtains. The curtains are extraordinarily durable and cannot simply be cut, torn or marked.
• Behaviour: The infirmary initially appears relatively normal near the entrance, but the bed section is distorted into a labyrinth.
• Attack mechanism: People who wander through the maze for long enough experience dizziness and vomiting. This appears to trigger access to the monster's area.
• Attack method: Restrains victims with bandages, examines them with a stethoscope, cuts into their bodies with scissors and applies disinfectant before wrapping them tightly in compression bandages.
• Temperament: Methodical, clinical and deeply disturbing. Its treatment resembles medical procedure stripped of compassion, consent and any actual healing purpose.
• Intelligence: Capable of exploiting the layout of its infirmary. Its environment is itself part of the attack.
• Territorial restriction: Cannot leave the infirmary. When it attempts to pursue Do-yun outside, an invisible barrier prevents it.
• Weakness: Its confinement to the infirmary is a major limitation. The maze also has discoverable spatial patterns, which can be documented.
• Narrative importance: Essentially the final major monster of Season 1. Its encounter shifts the danger from straightforward rule-breaking to psychological exhaustion, navigation and bodily vulnerability.

Personality shorthand: A twisted medical professional that treats suffering as a procedure.

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3. Monsters — School folklore manifestations

These monsters operate through supernatural folklore rather than ordinary classroom regulations.

9. Restroom Mirror Monster (화장실 거울 괴물)

44th Period Survival Class | LINE WEBTOON

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Territory: Inverted restroom

• Origin: A manifestation of school restroom mirror folklore and doppelgänger stories.
• Appearance: Initially manifests through distorted reflections of the people standing before the mirror. Its most dangerous manifestation is a duplicate of the victim.
• Behaviour: Uses mirrors to capture people and replace them with their own doppelgängers.
• Attack method: Extends its arms through the mirror, grabs a victim and pulls them into the mirrored world. A duplicate then emerges into the real world.
• Doppelgänger characteristics:
  • Their clothing is reversed, including the direction of uniform buttons.
  • Their speech appears backwards.
  • Their physical behaviour can imitate the original person.
  • Their bodies have unnatural physical characteristics.
• Identity deception: It exploits the trust people place in familiar faces. The replacement can look like someone the group knows.
• Limitations: Doppelgängers have restricted movement within the mirrored environment. The invisible boundaries of that environment also restrict their counterparts.
• Temperament: Predatory and deceptive rather than openly aggressive at first. It relies on confusion and impersonation.
• Weakness: Careful observation of inconsistencies in speech, appearance and physical behaviour.
• Important encounter: Seo Ye-rim is pulled into the mirrored world and replaced. Choi Yeon-jun notices that the duplicate's physical behaviour is unnatural and that the real Ye-rim's voice is still coming from the restroom.
• Narrative significance: Introduces identity-based horror. The threat is no longer simply being killed; it is having someone you recognise replaced by something that looks like them.

Personality shorthand: An identity thief that turns familiarity and trust into vulnerabilities.

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10. Broadcast Urban Legend Monster (방송 괴담 괴물)

44교시 생존수업

series.naver.com

Territory: Areas containing loudspeakers

• Origin: A manifestation of school broadcasting-room folklore.
• Physical form: Primarily operates through the school's loudspeaker system rather than appearing as a conventional physical creature.
• Behaviour: Broadcasts fake announcements that sound like legitimate school instructions.
• Manipulation: Its greatest weapon is institutional trust. Students and teachers instinctively obey what sounds like an official emergency announcement.
• Attack method: Hypnotises people who follow its instructions. Victims lose control of their bodies, repeatedly recite the broadcast and insert their fingers deeply into their ears.
• Physical consequences: Their eyes become vacant, and their ears bleed from the damage caused by their fingers.
• Control: It can make hypnotised people line up and move together, effectively turning a group into an obedient procession.
• Targeting: Can attempt to lure entire groups away from their safe locations.
• Intelligence: Its deception is considerably more sophisticated than a straightforward physical attack. It understands that people respond to authority and urgency.
• Weakness: Recognising inconsistencies in the announcement and refusing to obey suspicious instructions.
• Important encounter: It manipulates the 2nd Year Class 1 teacher and eight students. Later, it attempts to lure Group A into an evacuation trap, but Do-yun recognises the danger.
• Narrative significance: Shows that the school itself can become an unreliable source of information. A familiar announcement can be more dangerous than an approaching monster.

Personality shorthand: A manipulative voice that weaponises obedience, panic and institutional authority.

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4. The unexplained phenomenon

11. Anomaly / Spatial Distortion (이상현상)

44th Period: Survival Class Ep. 31 - Seismic Shifts (1) - A Webtoon Site

awebtoon.com

Territory: Almost the entire school

• Classification: Unidentified paranormal phenomenon. It is not confirmed to be a monster.
• First appearance: Episode 17.
• Appearance: Walls and floors become distorted, inflated or otherwise physically altered. Some walls also become unusually hot.
• Behaviour: Changes the school's architecture unpredictably, interfering with previously mapped routes.
• Effect on survivors: Previously documented maps become unreliable or completely useless.
• Spatial manipulation: Can alter the layout of the school and forcibly separate members of exploration groups.
• Danger: Its greatest threat is the destruction of predictability. Students can no longer rely on familiar corridors, previously established routes or even the assumption that their classroom remains safe.
• Intelligence: Unknown. There is no confirmed evidence that it consciously targets people.
• Temperament: Cannot meaningfully be classified as aggressive, passive or malicious because its nature remains unidentified.
• Territorial reach: Appears throughout much of the school rather than being confined to one room.
• Narrative importance: Becomes a major obstacle in the latter part of Season 1. It undermines the class's original four-group exploration strategy and forces students to survive independently.

Personality shorthand: Not a conventional predator, but an unpredictable force that destroys the very structure survivors depend upon.

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5. The black circle itself

44th Period Survival Class (Manga) | AnimeClick.it

animeclick.it

12. The Black Circle (검은 원)

• Classification: Unknown supernatural phenomenon.
• Nature: Mysterious black circular openings appear throughout the world.
• Primary effect: Anything swallowed by them disappears from the ordinary world.
• School incident: An entire school, including its students and staff, is swallowed.
• Environment: The school is transformed into a distorted, nightmarish environment containing monsters, altered architecture and supernatural rules.
• Monster creation: Objects, abstract concepts, school regulations and folklore appear to become physically manifested as hostile entities.
• Rules: The environment operates under conditions that do not necessarily correspond to normal reality.
• Purpose: Unknown. There is no confirmed explanation for why the circles appear, why they swallow particular locations or what determines the creatures inside them.
• Narrative importance: It is the overarching source of the survival situation, rather than simply another monster.

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6. Complete monster reference

| Entity | Main mechanism | Primary danger | | ----------------------- | ---------------------------- | ------------------------------------------- | | Korean Language Monster | Classroom rule | Decapitation | | Decalcomania Monster | Noise detection | Crushing and painting transformation | | Science Monster | Laboratory apparatus | Dissolution | | PE Monster | Gym-uniform rule | Coordinated attacks | | Ball Monsters | Whistle activation | Biting and transformation | | Infirmary Monster | Medical treatment distortion | Restraint and mutilation | | Restroom Mirror Monster | Doppelgängers | Identity replacement | | Broadcast Monster | Hypnotic announcements | Mind and body control | | Spatial Anomaly | Environmental distortion | Separation and disorientation | | Black Circle | Unknown | Displacement into the nightmare environment |

7. What makes these monsters different?

The most important distinction is that each monster exploits a different human instinct.

• Korean Language Monster: Fear of punishment and authority.
• Decalcomania Monster: Fear of making a mistake, even an accidental sound.
• Science Monster: Fear of unfamiliar mechanisms and dangerous experimentation.
• PE Monster: Fear of physical inadequacy and enforced conformity.
• Ball Monsters: Fear of losing one's humanity.
• Infirmary Monster: Fear of vulnerability, illness and medical helplessness.
• Restroom Mirror Monster: Fear of losing one's identity and trusting the wrong person.
• Broadcast Monster: Fear of emergencies and unquestioned authority.
• Spatial Anomaly: Fear of losing one's sense of direction and security.

The overarching horror of 44th Period is that ordinary school life becomes the weapon. Rules, classrooms, announcements, mirrors, sports equipment and medical facilities are all familiar things that the students previously trusted. Their transformation makes the environment itself hostile.

For reference, the official series is 44th Period: Survival Class by sangC on WEBTOON. The monster-specific details above are cross-checked against the Season 1 character and monster index. Some origins and mechanisms are explicitly described as theories in the story's reference material, so I have preserved that uncertainty rather than presenting speculation as canon.

One important limitation: This is primarily a Class 1-4 Season 1-oriented dossier, not a claim that every student's personality remains unchanged throughout the later chapters.

44th Period: Survival Class — Season 1 master reference

FULL SEASON 1 SPOILERS · Episodes 1–34

This is the universe bible: rules, mechanics, survival strategies, group assignments and changes, character functions, deaths, monster encounters, secondary survivors and the finale. I'm using the Korean character roster where necessary, particularly Yang So-yeon (양소연), not So-hyeon.

One important distinction: Season 1 ends at Episode 34, with five confirmed student deaths and several unresolved situations. Being alive, missing and confirmed dead are three different statuses.

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1. Universe mechanics — keywords

| Element | Rules / information | | -------------------- | ----------------------------------------------------------------------------------------------------------- | | Black Circles | Worldwide appearances; mysterious black holes/portals; anyone swallowed has no known return history | | School incident | Entire Seono High School swallowed; students and staff transported into an unknown environment | | Environment | Familiar school architecture, distorted corridors, altered rooms, impossible spatial layouts | | Communication | Ordinary external communication unavailable; phones do not provide a normal connection to the outside | | Time | Repeating school timetable; class periods and breaks govern movement | | Class time | 10 minutes; classroom is the safe zone | | Break time | 50 minutes; exploration and movement permitted | | Classroom protection | Monsters cannot enter classrooms | | Monster territories | Certain monsters are bound to specific rooms or conditions; leaving their territory can limit their pursuit | | Rules | Specific monsters enforce specific school rules; violations can mean immediate death | | Monster logic | Not all are intelligent; many follow fixed triggers, sensory conditions or territorial restrictions | | Information | No reliable outside guidance; survivors must observe, test, document and share discoveries | | Maps | Initially essential for navigation; become unreliable after spatial distortions | | Death records | Student identification photographs change to indicate deaths; the class uses these to track members | | Escape | The existence of an exit is uncertain initially; by the finale, evidence points towards an exit below |

Core survival principles

• Never assume an ordinary school rule is harmless.
• Never enter an unfamiliar room without considering its associated rule.
• Distinguish a monster's territory from its hunting range.
• Identify triggers before testing a suspected weakness.
• Don't confuse a monster's temporary inactivity with safety.
• Never trust an announcement merely because it sounds official.
• Record discoveries and communicate them to other groups.
• Avoid unnecessary noise, movement and separation.
• A successful escape strategy for one monster does not automatically work on another.

The series deliberately makes the school itself unreliable: maps, corridors, announcements and room boundaries can all become dangerous.

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2. Timetable and movement system

One repeating cycle

Class period

10 minutes

Rest, regroup, discuss information, plan and remain inside the classroom.

Break period

50 minutes

Explore, map territories, locate survivors, investigate monsters and return to safety.

Practical implication: The class period is the protected planning window; the break is the dangerous operational window. The first teacher dies because he treats the altered school as an ordinary emergency and walks into the corridor during class.

3. Monster rulebook — condensed

| Monster | Trigger / rule | Attack / countermeasure | | ---------------------- | ---------------------------------------------------- | ----------------------------------------------------------------------------- | | Korean Language | In corridor during class | Decapitation; stay inside classroom | | Decalcomania | Sound in corridor | Folds architecture, turns victims into paintings; silence and sound diversion | | Science | Laboratory territory / unsafe experimental behaviour | Captures and melts victims; specialised escape condition | | PE teacher | Gymnasium, gym-uniform enforcement | Controls Ball Monsters; understand uniform rule | | Ball Monsters | Whistle/command activation | Charge, bite and transform victims; avoid activation | | Restroom Mirror | Mirror exposure / prolonged interaction | Replaces person with reflection-double; inspect inconsistencies | | Broadcast Urban Legend | Obeying false announcement | Hypnosis and mass disappearance; question announcements | | Infirmary | Entering the infirmary | Maze, restraint and mutilation; no fully established safe procedure | | Spatial anomaly | No confirmed trigger | Warps architecture, separates students, changes routes |

Monster limitations: Classrooms are protected; some monsters are territorial; others have sensory limitations. Do not assume every monster shares the same restrictions. In particular, the infirmary monster's exact rule is not conclusively established by the end of Season 1.

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4. The four exploration groups — actual assignments and shifts

The four groups are not random survival parties. They are assigned separate areas to explore, map and report back on. Their different personalities also produce very different survival styles.

Group A — Investigation / adaptability / interpersonal strain

Most monster encounters alongside B

Initial members: Kim Do-yun, Choi Won-gyun, Im Seon-ah, Choi Seo-jeong.

Responsibilities

• Do-yun — Lead investigator; analyses monster mechanics, tests hypotheses, devises escape plans.
• Won-gyun — Companion, physical support, emotional presence; often frightened but willing to help.
• Seon-ah — Maps, observations, details, careful recording; dependable during exploration.
• Seo-jeong — Initially an uneasy addition; distrustful, defensive and frequently creates interpersonal friction.

Group dynamic

• Original trio: Do-yun, Won-gyun and Seon-ah already have a comfortable friendship.
• Seo-jeong's addition disrupts the original social balance.
• Do-yun and Seon-ah become the principal investigative partnership.
• Won-gyun provides companionship and physical assistance, although panic affects his reactions.
• The group encounters the Decalcomania Monster, Broadcast Monster, Infirmary Monster and spatial anomalies.

Group shift — Episode 14

• Seo-jeong transfers from A to D.
• Yang So-yeon transfers from D to A.
• This improves the group's interpersonal atmosphere.

Later additions

• Kim Do-hyun (Do-yun's older sister) joins the A-group survivors in the infirmary.
• Do-yun and Do-hyun become involved in a dangerous escape attempt.
• Won-gyun and Seon-ah attempt to prevent Do-hyun's sacrifice.

Ending

• Seo-jeong dies in the infirmary.
• Won-gyun dies during the spatial-distortion sequence.
• Do-yun is knocked unconscious by falling debris.
• Seon-ah and Do-hyun are trapped inside the infirmary after the window becomes blocked.

Overall function: Investigation, information gathering and improvisation. A group's greatest strength is analytical cooperation; its greatest weakness becomes the accumulating physical and psychological damage.

Group B — Leadership / tactical survival / rescue

Most safety-conscious group

Initial members: Kim Tae-hyun, Nam Jeong-woo, Han Su-jin, Choi Na-ri.

Responsibilities

• Jeong-woo — Class leader; briefings, strategy, deductions, coordinating survival.
• Tae-hyun — Physical support and emotional support for Jeong-woo.
• Su-jin — Direct action, confrontation, rescue and protection.
• Na-ri — Group member; particularly close to Su-jin.

Group dynamic

• The most deliberately safety-conscious group.
• Jeong-woo prefers careful planning over unnecessary risks.
• Su-jin is more forceful and action-oriented.
• Tae-hyun supports Jeong-woo, particularly emotionally.
• Na-ri is quieter and closely attached to Su-jin.
• Despite their different personalities, the group functions effectively.

Temporary shift

• Choi Hyun-jun temporarily joins B when they go looking for Ye-rim, taking Na-ri's place in that expedition.
• This is a temporary mission arrangement, not a permanent reassignment.

Major encounters

• Decalcomania Monster.
• Spatial anomaly.
• PE Monster.
• Ball Monsters.

Tactical achievement

• Jeong-woo identifies and exploits the PE Monster's uniform-related restrictions.
• The group survives the gymnasium encounter.
• It subsequently encounters survivors from Class 2-1.

Ending

• Su-jin dies as a result of the PE Monster's Ball Monster attack.
• She pushes Na-ri out of danger, sacrificing herself to save her friend.
• The surviving B members reach the Class 2-1 survivors.

Overall function: Tactical coordination, risk management, rescue and leadership. The group demonstrates how effective planning can compensate for a lack of supernatural strength.

Group C — Knowledge / observation / practical exploration

Fewest major monster encounters

Initial and continuing members: Lee So-han, Oh Seung-jae, Kim Ji-eun, Im I-ji.

Responsibilities

• So-han — Most knowledgeable about the black-circle environment; explains survival mechanics and recognises dangerous assumptions.
• Seung-jae — Physical presence, initiative, exploration; sometimes acts before considering consequences.
• Ji-eun — Maps and spatial organisation; investigates environmental irregularities.
• I-ji — Exploration and group participation; also part of the established friendship among the other members.

Group dynamic

• I-ji, Seung-jae and Ji-eun are already close.
• So-han is more isolated and quiet.
• Ji-eun makes an effort to include So-han.
• So-han's knowledge gives the group an important informational advantage.
• The group does not undergo a membership exchange during Season 1.

Major encounter

• Science Monster.
• Spatial anomaly.

Important sequence

• Seung-jae becomes impatient and pushes exploration.
• He and I-ji encounter the Science Monster.
• I-ji is dragged into danger.
• Ji-eun contributes to identifying the monster's escape condition.
• Seung-jae ultimately dies to the monster's experimental processing mechanism.

Ending

- So-han, Ji-eun and I-ji remain alive at the Season 1 endpoint, although the spatial disruption complicates their whereabouts.

Overall function: Environmental understanding, practical organisation and specialised monster knowledge. Their relatively low encounter count does not mean their encounters are less dangerous.

Group D — Fragmented social structure / eventual cohesion

Lowest monster exposure

Initial members: Jeon Seok-oh, Choi Hyun-jun, Seo Ye-rim, Yang So-yeon.

Responsibilities

• Seok-oh — Physical confrontation, aggressive action and leadership through intimidation.
• Hyun-jun — More restrained counterpart; assists the group and recognises behavioural inconsistencies.
• Ye-rim — Emotionally vulnerable member; requires reassurance and support.
• So-yeon — Social and emotional support; later becomes an important member of A.

Group dynamic

• Initially the least cohesive group.
• Seok-oh and Hyun-jun have a delinquent social background.
• Ye-rim and Seo-jeong are less socially integrated.
• Personality differences create friction.
• Seok-oh initially handles Ye-rim's crying roughly, but does provide practical assistance.
• After the first death, both Seok-oh and Hyun-jun show guilt and become more considerate towards the remaining members.

Episode 14 exchange

• So-yeon moves to A.
• Seo-jeong moves from A to D.
• The group becomes Seok-oh, Hyun-jun, Ye-rim and Seo-jeong.

Major encounter

• Restroom Mirror Monster.
• Spatial anomaly.

Outcome

• Ye-rim is replaced by a mirror duplicate and dies inside the mirrored world.
• Hyun-jun recognises that the apparent Ye-rim is behaving unnaturally.
• Seok-oh and Hyun-jun become more protective of the group following her death.
• Seo-jeong later leaves for A's original position, while So-yeon remains with A.
• D continues to map the school even after the other groups' mapping plans become increasingly impractical.
• It is the last group to return safely to the class's original meeting point.

Overall function: Demonstrates the evolution from an awkward, fragmented group into a more considerate and resilient one.

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5. Group transfers — chronological record

| Episode | Change | Reason / consequence | | ----------------- | ---------------------------- | -------------------------------------------------------- | | Initial | A, B, C, D formed | Four-zone mapping strategy | | 14 | Seo-jeong: A → D | Swapped with So-yeon | | 14 | So-yeon: D → A | Swapped with Seo-jeong | | Rescue expedition | Hyun-jun temporarily joins B | Search for Ye-rim; replaces Na-ri in that mission | | Later | Do-hyun joins A's survivors | Infirmary encounter | | 34 | All groups separated | Spatial upheaval destroys the original group arrangement |

Important: The exchange of Seo-jeong and So-yeon is the only permanent change to the original four group rosters during Season 1. Hyun-jun's B-group participation is temporary.

6. Death register — all five confirmed student deaths

Spoilers: complete death order

| Order | Student | Episode | Cause / circumstances | | ----- | -------------- | ------- | ---------------------------------------------------------------------------------------------------------------------------------------- | | 1 | Seo Ye-rim | 13 | Mirror duplicate repeatedly strikes its head against an invisible barrier; real Ye-rim suffers the same injuries inside the mirror world | | 2 | Oh Seung-jae | 16 | Science Monster captures and processes him; solid, liquid and gaseous remains | | 3 | Han Su-jin | 22 | PE Monster's Ball Monster attack; she saves Na-ri by pushing her away and becomes a My Ball | | 4 | Choi Seo-jeong | 32 | Killed by the Infirmary Monster | | 5 | Choi Won-gyun | 33 | Dies after falling during the spatial-distortion disaster |

The first teacher's death precedes these five student deaths.

Why these deaths matter

• Ye-rim: The group loses its most vulnerable member; guilt changes D's behaviour.
• Seung-jae: Demonstrates that physical size and impulsive courage cannot substitute for understanding a monster.
• Su-jin: Establishes her protective instinct through her final decision; Na-ri survives because of her.
• Seo-jeong: A student perceived as socially troublesome is ultimately killed by the environment, not by another student.
• Won-gyun: The loss of Do-yun's close friend devastates A and makes the finale especially bleak.

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7. Other important survivors — Class 2-1 and family

These characters matter because Season 1 gradually expands the story beyond Class 1-4.

Kim Do-hyun (김도현)

Class 2-1 · A-group associate

• Do-yun's older sister; attends Class 2-1.
• Separated from Do-yun when the school is swallowed.
• Survives independently before reconnecting with her brother.
• Calm, capable and informative under pressure.
• Helps Do-yun understand the situation and navigate the infirmary.
• Reunites with Do-yun during the infirmary arc.
• Her survival becomes a personal priority for Do-yun.
• Nearly sacrifices herself during their escape; Won-gyun and Seon-ah intervene.
• End of Season 1: Trapped in the infirmary with Seon-ah; fate unresolved.

Shim Yu-jin (심유진)

Class 2-1 · Independent decision-maker

• One of the seven students who survive the initial broadcast incident.
• Recognises something suspicious about the announcement instructing students to go to the playground.
• Stops classmates from following it.
• Her decision saves Kim Yul, Woo Ji-hoo, Lee Chan-seok and other students.
• Observant, sceptical and capable of resisting mass panic.
• Understands that apparent authority does not necessarily mean safety.
• Informs B-group about the spatial changes affecting Class 2-1.
• Accepts Jeong-woo's proposal to cooperate.
• End of Season 1: Alive, cooperating with B.

Kim Yul (김율)

• Class 2-1 student.
• One of the seven survivors protected by Yu-jin's decision.
• Goes outside with B-group during their exploration.
• Helps B-group understand the circumstances of the second-year survivors.
• End of Season 1: Alive; joins the wider survivor alliance.

Woo Ji-hoo (우지후)

• Class 2-1 student.
• One of the students prevented from following the false broadcast.
• Survives alongside Yul, Yu-jin and Chan-seok.
• Participates in the eventual cooperation with B-group.
• End of Season 1: Alive.

Lee Chan-seok (이찬석)

• Class 2-1 student; tall, physically imposing appearance.
• Has a relatively intimidating exterior but is not necessarily hostile.
• One of Yu-jin's seven protected survivors.
• Survives the broadcast incident and later meets B-group.
• End of Season 1: Alive; part of the developing alliance.

Other Class 2-1 survivors

• Additional unnamed students survive because Yu-jin recognises the announcement's inconsistency.
• The teacher and most of the class are lost during the broadcast incident.
• The seven students who resist the announcement form the surviving core.

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8. Human relationship network — important connections

| Characters | Relationship / dynamic | | ------------------------- | ------------------------------------------------------------------------ | | Do-yun – Won-gyun | Close male friendship; trust, humour, mutual support | | Do-yun – Seon-ah | Trust, teamwork, analytical and observational partnership | | Do-yun – Do-hyun | Siblings; reunion, protection, sacrifice | | Do-yun – So-yeon | Friendship and familiarity; she joins his group | | Seon-ah – So-yeon | Close female friendship; emotional reassurance | | So-han – Ji-eun | Quiet, reserved student and socially attentive friend | | Ji-eun – I-ji – Seung-jae | Established friendship | | Jeong-woo – Tae-hyun | Mutual trust; emotional support | | Su-jin – Na-ri | Particularly close friendship; protective affection | | Su-jin – Seok-oh | Hostility and confrontation | | Su-jin – Hyun-jun | Friction, particularly during interactions involving Seok-oh | | Seok-oh – Hyun-jun | Delinquent-associated friendship; eventually more considerate behaviour | | Ye-rim – D-group | Vulnerability, reassurance and eventual loss | | Ye-rim – Hyun-jun | His recognition of the mirror duplicate's unnatural behaviour is crucial | | Seo-jeong – Classmates | Social alienation, suspicion and interpersonal difficulty | | Jeong-woo – Yu-jin | Mutual recognition of leadership and the need for cooperation | | B-group – Class 2-1 | Rescue, reunion and alliance |

The important social development: The class starts with pre-existing friendships and relatively clear social circles. Survival forces students to cooperate beyond those circles. The strongest relationships aren't necessarily between the most similar personalities; they emerge from trust, complementary abilities and shared danger.

9. Character function index — what each person contributes

This is the functional classification, rather than another personality description.

| Character | Primary function | Secondary function | | --------- | ----------------------- | ------------------------------- | | Do-yun | Investigation | Strategy, improvisation | | Won-gyun | Physical assistance | Friendship, rescue | | Seon-ah | Documentation | Observation, emotional support | | Seo-jeong | Interpersonal friction | Suspicion, self-preservation | | Tae-hyun | Physical support | Emotional support | | Jeong-woo | Leadership | Tactical planning, coordination | | Su-jin | Protection | Direct action, rescue | | Na-ri | Group cohesion | Close interpersonal bonds | | So-han | Survival knowledge | Risk assessment | | Seung-jae | Exploration | Initiative, physical presence | | Ji-eun | Mapping | Spatial observation | | I-ji | Group participation | Exploration | | Seok-oh | Confrontation | Physical action | | Hyun-jun | Observation | Recognition of deception | | Ye-rim | Emotional vulnerability | Human cost of survival | | So-yeon | Emotional support | Group cohesion | | Do-hyun | Independent survival | Information, sibling protection | | Yu-jin | Independent leadership | Critical thinking | | Yul | Survivor cooperation | Exploration | | Ji-hoo | Survivor cooperation | Group support | | Chan-seok | Physical presence | Survivor cooperation |

10. Season 1 chronological timeline — all major arcs

Episodes 1–34, in story order. This is an event index rather than a scene-by-scene retelling.

1. Episodes 1–5 — The black circle / initial survival
   • Black circles appear worldwide.
   • Do-yun's family and school are introduced.
   • Entire school swallowed.
   • First teacher investigates corridor and is decapitated.
   • Jeong-woo takes responsibility for the class.
   • Su-jin stops Seung-jae from recklessly leaving.
   • So-han explains the importance of understanding the black circle.
   • Students establish class-time safety and break-time exploration.
   • Four groups formed; mapping begins.
2. Episodes 6–14 — Art / mirrors / group restructuring
   • Decalcomania Monster discovered.
   • Dead students transformed into paintings.
   • Do-yun identifies sound sensitivity.
   • Phone and other noises become diversion tactics.
   • D-group encounters the Restroom Mirror Monster.
   • Ye-rim captured and replaced.
   • Hyun-jun recognises the duplicate.
   • Ye-rim dies in the mirror world.
   • Students search for her.
   • Episode 14: Seo-jeong and So-yeon exchange groups.
3. Episodes 15–18 — Science laboratory / first major C-group loss
   • Science Monster encounter.
   • Seung-jae and I-ji enter danger.
   • Ji-eun contributes to identifying the monster's weakness.
   • Seung-jae dies.
   • Spatial abnormalities become more apparent.
   • Groups begin recognising that monster territories and school layout are connected.
4. Episodes 19–24 — Gymnasium / B-group crisis
   • B-group explores the gymnasium.
   • PE Monster and Ball Monsters encountered.
   • Gym-uniform restriction becomes essential.
   • Jeong-woo works out the survival strategy.
   • Su-jin dies protecting Na-ri.
   • B-group encounters the second-year students.
   • Class 2-1 survivors begin interacting with B-group.
5. Episode 25 — Broadcast curse
   • False emergency broadcast revealed.
   • Class 2-1's teacher and numerous students disappear.
   • Yu-jin's earlier suspicion saves seven students.
   • Do-yun's group also encounters the broadcast threat.
   • False authority and mass obedience become major themes.
6. Episodes 26–30 — Infirmary
   • Do-yun explores the infirmary.
   • Discovers the bed-and-curtain maze.
   • Encounters the Infirmary Monster.
   • Spatial navigation and environmental observation become essential.
   • Do-yun encounters his sister Do-hyun.
   • A-group survivors become involved in the escape.
   • Do-hyun's sacrifice is prevented.
   • Seon-ah, Won-gyun and Do-yun continue attempting to save their companions.
7. Episodes 31–34 — Seismic shifts / Season 1 finale
   • Large-scale spatial distortion intensifies.
   • Walls, floors and corridors become unreliable.
   • Existing maps lose practical usefulness.
   • Groups become separated.
   • Seo-jeong dies.
   • Won-gyun dies.
   • Do-yun is knocked unconscious.
   • Seon-ah and Do-hyun become trapped.
   • D-group manages to return.
   • B-group cooperates with the Class 2-1 survivors.
   • Jeong-woo deduces that the black circle's exit is below.
   • The original four-group survival arrangement effectively collapses.

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11. The school’s wider population and supporting authority

The Class 1-4 homeroom teacher

• Male, Korean-language teacher.
• Distributes black-circle warning notice before the incident.
• First adult to investigate the changed school.
• First confirmed human casualty.
• Death establishes the danger of leaving the classroom during lessons.

Class 2-1 homeroom teacher

• Female teacher.
• Leads students after receiving the apparent evacuation announcement.
• Hypnotised by the Broadcast Monster.
• Her obedience contributes to the disappearance of most of her class.
• Final fate unconfirmed.

Do-yun and Do-hyun's parents

• Introduced during the family's birthday celebration before the incident.
• Their children's disappearance becomes the human-world emotional counterpoint to the survival narrative.
• Mother and father remain outside the black circle.
• The family is not reunited by the end of Season 1.

Jung Ji-woo (정지우)

• Class 1-3 student.
• Close friend of Do-yun and Won-gyun.
• Important to their ordinary school-life relationships before the disaster.
• Appears in the early exploration/death aftermath through the connection to Do-yun and Won-gyun.

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12. End-of-Season-1 status board

Five confirmed student deaths

| Character | Season 1 ending position | | --------- | -------------------------------------- | | Do-yun | Unconscious after spatial disturbance | | Won-gyun | Dead | | Seon-ah | Trapped in infirmary | | Seo-jeong | Dead | | Tae-hyun | Separated / whereabouts uncertain | | Jeong-woo | With the Class 2-1 survivor alliance | | Su-jin | Dead | | Na-ri | With the surviving B-group situation | | So-han | Separated following spatial disruption | | Seung-jae | Dead | | Ji-eun | Surviving | | I-ji | Surviving | | Seok-oh | Surviving; D-group | | Hyun-jun | Surviving; D-group | | Ye-rim | Dead | | So-yeon | Surviving; A-group |

This is the Season 1 endpoint, not the later Season 2 status. Some students' exact whereabouts are unresolved rather than confirmed dead.

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namu.moe+2

13. The essential logic of the universe

The following are the most useful concepts to retain when interpreting the story or constructing scenarios in this universe.

| Keyword | Meaning | | ----------------------- | ------------------------------------------------------------ | | Rule-based horror | Every monster has conditions governing its attacks | | Territory | Monster's designated operating area | | Trigger | Action or condition that activates aggression | | Safe zone | Classroom during class time | | Investigation | Observe before acting | | Countermeasure | Exploit a monster's specific limitation | | Environmental hostility | School itself is unreliable | | Spatial distortion | Architecture changes and separates survivors | | Information asymmetry | Different groups possess different discoveries | | Mapping | Establish routes, territories and anomalies | | False authority | Announcements can manipulate entire groups | | Doppelgänger | Familiar identity can be imitated | | Transformation | Humans can become parts of the monster system | | Collective survival | Information-sharing matters more than individual strength | | Unresolved danger | A monster's weakness is not necessarily a permanent solution | | Exit hypothesis | Escape lies below, according to Jeong-woo's final deduction |

14. Five things that define Season 1

1. The school is a system, not merely a location. Its rules determine what is safe, what is dangerous and what triggers monsters.
2. Knowledge is the primary weapon. Do-yun, So-han, Jeong-woo and Ji-eun contribute through different forms of reasoning.
3. Different groups have different survival personalities. A investigates, B coordinates, C relies on knowledge and D develops cohesion.
4. The monsters exploit human familiarity. Students are endangered by the very rules, objects and institutions they grew up trusting.
5. Survival is not the same as escape. The finale destroys the original plan, separates the students and leaves the larger mystery unresolved.

Primary reading reference: Official WEBTOON — 44th Period: Survival Class. The Season 1 episode range is 1–34; the afterword is Episode 35.

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WEBTOON+1

Canon caution: A few details in fan-maintained reference material are interpretations rather than explicitly confirmed rules, particularly the exact Infirmary Monster trigger and the nature of the spatial anomaly. I've kept those marked as unknown rather than inventing a universal rule. This is important because the series' central mechanic is discovering rules, not assuming them.

You are a student of Class 1-4. It starts as an ordinary school day: familiar classmates, teachers, lessons, break periods, petty arguments, friendships, awkward interactions and the usual classroom chaos.

Then, without warning, a mysterious black circle appears and swallows the entire school.

When you come to your senses, the school is still recognisable—but horribly wrong. The corridors stretch into unfamiliar spaces, familiar rooms have become dangerous territories, and things that should be harmless have turned into monsters. The outside world is unreachable. Nobody knows where the school has gone, whether anyone outside knows what happened, or whether escape is even possible.

You're right — I changed the opening too much. The canon opening has the teacher inside the classroom with the students, and his death is the first time they witness what the school has become. Here's the scene following that sequence, with the original characters and no Y/N.

44th Period: Survival Class

Scene 1 — The Korean Language Monster

Class 1-4. Shortly after the black circle swallows the school.

The classroom is in disarray.

Students are slowly recovering from the sudden disturbance. Some are still seated, others are standing around, trying to look outside through the windows.

Their teacher is still present.

Teacher: "Everyone, calm down. There's no need to panic."

Seung-jae: "Sir, what the hell just happened?"

Teacher: "I don't know yet. Just stay inside the classroom."

Won-gyun: "The entire outside is black. How are we supposed to stay calm?"

Seon-ah: "Can you stop shouting?"

Won-gyun: "You're shouting too!"

At the front, Jeong-woo, the class president, tries to get everyone's attention.

Jeong-woo: "Everyone, quiet down for a second. We need to figure out what's happening."

Teacher: "That's enough. I'll go outside and check the situation. Nobody leaves this classroom."

Do-yun: "Sir, shouldn't you wait?"

Teacher: "I'll only be gone for a moment."

He opens the classroom door and steps into the corridor.

For a brief moment, everything seems normal.

Then a strange girl appears in the hallway.

She looks like a figure from a Korean-language textbook: an ordinary schoolgirl in appearance, but something about her is deeply unsettling.

The teacher stops.

Teacher: "…Who are you?"

The girl approaches.

The students watching from inside the classroom don't immediately understand what's happening.

Then—

The teacher is attacked.

His head is severed.

A moment later, his body collapses.

Inside the classroom, the few students who witnessed it stand frozen.

Do-yun: "…"

Jeong-woo: "What…?"

Seon-ah: "Did… did you see that?"

Do-yun: "Don't open the door."

The classroom erupts into panic.

Seung-jae: "WHAT THE HELL WAS THAT?!"

Won-gyun: "THE TEACHER—!"

Na-ri: "Oh my God…"

Su-jin: "Everyone, get away from the door!"

Tae-hyun: "Someone call the police!"

I-ji: "There's no signal!"

The girl remains outside.

She doesn't enter the classroom.

She simply stands in the corridor.

Do-yun: "She killed him."

Jeong-woo: "I saw."

Do-yun: "And she hasn't come inside."

Jeong-woo looks at the door, then at the clock.

Jeong-woo: "Everyone stay inside. Nobody goes out."

Won-gyun: "Are you seriously telling us to just sit here?!"

Jeong-woo: "I'm telling you not to get killed!"

The girl eventually disappears from view.

But the students have already understood one thing.

Their school is no longer safe.

And the first rule of survival has been written in blood.

END SCENE.

Canon clarification: The teacher's death establishes the danger of wandering the corridors during class time. The classroom is safe from this particular monster, and the class gradually works out the class-period/break-period rules. The opening also establishes that only a small number of students initially witness the killing directly; the rest learn about it through the survivors.

Here’s a character dialogue reference for the entire Season 1 cast of 44th Period: Survival Class. The idea is to establish how each character would speak to an ordinary classmate, a close friend, someone irritating, or someone in danger.

These are illustrative dialogues, not verbatim manhwa dialogue. I'll keep their established roles and dynamics in mind rather than making everyone sound like generic horror protagonists.

1. Class 1-4 — The main sixteen

A Group

1. Kim Do-yun

Observant · Quiet · Practical

• A classmate panics: "Lower your voice. You're not helping anyone by screaming."
• Someone gets injured: "Let me see. Don't move your arm."
• Someone asks if he'll abandon them: "If I wanted to leave you, I wouldn't still be here."
• A classmate makes a stupid decision: "You could've gotten yourself killed. Think before you move."
• A friend teases him: "Are you done?"
• When things get genuinely frightening: "…Stay behind me."

Interaction style: Doesn't waste words. Watches people carefully. More likely to demonstrate concern through actions than reassurance. Can be blunt, but isn't necessarily indifferent.

2. Choi Won-gyun

Emotional · Expressive · Close to Do-yun

• A classmate gets hurt: "WAIT, WAIT! Is that blood?!"
• Someone suggests exploring: "Are you insane? Have you looked outside?"
• Do-yun ignores him: "Yah! I'm talking to you!"
• Someone insults him: "What did you just say?!"
• After witnessing something horrifying: "I-I can't… I can't do this."
• Someone tries to comfort him: "Don't tell me to calm down! You didn't see what I saw!"

Interaction style: Very visibly emotional. Fear, anger, frustration and affection show on his face. He can be loud and reactive, especially when frightened. His closeness with Do-yun is important.

3. Im Seon-ah

Blunt · Sharp-tongued · Assertive

• A classmate cries: "Can you stop? You're making it harder for everyone."
• Someone is being reckless: "Do you have a death wish?"
• A friend is injured: "Sit down. You're not walking around like that."
• Someone talks back: "Oh, so now you have something to say?"
• A classmate thanks her: "Don't make it weird."
• Someone underestimates her: "Try me."

Interaction style: Not particularly delicate with people. She can sound harsh even when she is concerned. Doesn't automatically comfort someone just because they're upset.

4. Choi Seo-jeong

Socially isolated · Reserved · Vulnerable

• A classmate approaches her: "…Did you need something?"
• Someone offers to help: "I can do it myself."
• A group leaves her behind: "Wait… Are you going without me?"
• Someone is unexpectedly kind: "Why are you being nice to me?"
• Someone blames her: "I didn't mean for that to happen."
• When frightened: "Please… don't leave me here."

Interaction style: More withdrawn than confrontational. May struggle to ask for help or feel secure around others. Her reactions should reflect her isolation rather than making her inexplicably helpless.

A-group dynamics

Do-yun and Won-gyun

Won-gyun: "You could at least pretend to care!"

Do-yun: "I'm standing right here."

Won-gyun: "THAT'S NOT THE POINT!"

Seon-ah: "Both of you are exhausting."

B Group

5. Nam Jeong-woo

Class president · Organised · Responsible

• Someone refuses instructions: "You don't have to like me. Just listen."
• A classmate is injured: "Who's capable of helping? We need to move quickly."
• Someone wants to run away: "Running without a plan is how people die."
• Someone challenges his authority: "Then come up with a better solution."
• A classmate thanks him: "Save it. We still have work to do."
• A difficult decision arises: "I'll take responsibility for the decision."

Interaction style: Organises people, assesses risks and tries to keep everyone functioning. Can become controlling because he feels responsible for the group.

6. Han Su-jin

Protective · Decisive · Action-oriented

• A classmate is being threatened: "Get behind me."
• Someone freezes: "Look at me. Move when I tell you."
• A classmate is reckless: "You don't get to endanger everyone because you're scared."
• Someone is injured: "Can you stand? No? Then I'll help you."
• Someone thanks her: "You can thank me when we're out."
• Someone asks why she risked herself: "What else was I supposed to do?"

Interaction style: Protective without being overly sentimental. More likely to act than debate. Can be firm when someone's behaviour threatens others.

7. Kim Tae-hyun

Supportive · Steady · Cooperative

• A classmate needs help: "Here. I'll carry that."
• Someone panics: "Hey, breathe first. We can figure this out."
• Someone argues: "Can we do this later? Seriously."
• A classmate is left behind: "Wait. We're missing someone."
• Someone asks him to take a risk: "If it's necessary, I'll go."
• When frightened: "I don't like this. Not one bit."

Interaction style: A stabilising presence. Less interested in dominating conversations and more interested in getting things done.

8. Choi Na-ri

Social · Emotionally expressive · Close to Su-jin

• A classmate is injured: "Oh my God, are you okay?"
• Someone ignores her: "Hello? I'm talking to you!"
• A monster appears: "WHY IS IT MOVING LIKE THAT?!"
• Someone reassures her: "You promise?"
• Su-jin takes a risk: "Don't you dare do anything stupid!"
• Someone acts cold: "You could at least pretend to have feelings."

Interaction style: Expressive and reactive. Her bond with Su-jin is particularly important, and she can become deeply distressed when Su-jin is in danger.

B-group dynamics

Jeong-woo and Su-jin

Jeong-woo: "We need to leave in two minutes."

Su-jin: "Then stop wasting one arguing."

Tae-hyun: "I can get the supplies."

Na-ri: "And I can… stay here?"

Su-jin: "You can keep watch."

Na-ri: "That sounds considerably worse."

C Group

9. Lee So-han

Knowledgeable · Analytical · Informative

• Someone asks about the black circle: "There were reports about this phenomenon before."
• A classmate dismisses his explanation: "You can disagree. It doesn't change the evidence."
• Someone wants to touch a suspicious object: "Don't. We don't know what triggers it."
• A classmate asks for a plan: "First, we observe. Then we test. Not the other way around."
• Someone makes fun of him: "Are you finished?"
• When he doesn't know something: "I don't know. That's why we need to investigate."

Interaction style: Explanatory and analytical. He tends to approach unusual events through information and observation rather than instinct.

10. Oh Seung-jae

Impulsive · Physical · Reactive

• Someone hesitates: "Just move!"
• A classmate insults him: "Say that again."
• Someone needs rescuing: "I'll get them!"
• A plan is too complicated: "Why don't we just break through?"
• Someone tells him to wait: "And let them die?"
• When frightened: "Shit! SHIT!"

Interaction style: Acts quickly, sometimes before thinking. His physical reactions and impulsiveness can make situations worse even when his intentions aren't bad.

11. Kim Ji-eun

Observant · Intelligent · Analytical

• Someone makes an incorrect assumption: "That doesn't follow."
• A classmate asks what she noticed: "The corridor wasn't this long before."
• Someone is being careless: "Can you stop touching everything?"
• A friend is upset: "Sit down. I'll explain."
• Someone asks whether a theory is certain: "No. It's a possibility."
• During danger: "Wait. Look at its movement."

Interaction style: Notices patterns and details. Tends to contribute through observation and reasoning rather than loud leadership.

12. Im I-ji

Close friendships · Reactive · Impulsive tendencies

• A friend is about to do something stupid: "HEY! What are you doing?"
• Someone insults her: "Excuse me?"
• A classmate needs help: "Move. I'll help."
• Someone is overthinking: "Can we just do something?"
• A friend is frightened: "Stay with me."
• When something goes wrong: "Oh, you've got to be kidding me."

Interaction style: More emotionally immediate than So-han or Ji-eun. Her friendships within C are an important part of the group's dynamic.

C-group dynamics

So-han, Ji-eun, I-ji and Seung-jae

Seung-jae: "I'm telling you, we can get through there."

Ji-eun: "You haven't even checked what's there."

Seung-jae: "So?"

So-han: "That's precisely why we shouldn't."

I-ji: "Can we have one conversation without someone trying to get themselves killed?"

D Group

13. Jeon Seok-oh

Confrontational · Defiant · Tough exterior

• Someone gives him orders: "Who made you my boss?"
• A classmate challenges him: "You got a problem?"
• Someone is scared: "Then don't stand in the way."
• A friend is in danger: "Move! I'll handle it."
• Someone accuses him of being selfish: "You don't know anything about me."
• When he realises he's wrong: "…Whatever. Just go."

Interaction style: Doesn't like being controlled or patronised. Can be aggressive and difficult to cooperate with, particularly early on.

14. Choi Hyun-jun

Delinquent-associated · Cautious · Observant

• Seok-oh starts an argument: "Forget it. It's not worth it."
• Someone suspicious approaches: "Stay where you are."
• A classmate is behaving strangely: "Something's off about them."
• Someone asks for help: "What happened?"
• A friend is in danger: "Seok-oh! Over here!"
• Someone thanks him: "Don't mention it."

Interaction style: Often more restrained than Seok-oh. Can be observant and notices inconsistencies that others miss.

15. Seo Ye-rim

Socially isolated · Quiet · Vulnerable

• Someone speaks to her: "…Me?"
• A classmate asks her to join: "Are you sure?"
• Someone is rude: "I didn't do anything…"
• Someone offers protection: "Thank you."
• When she feels uncomfortable: "Can we go somewhere else?"
• When terrified: "Please, don't leave me."

Interaction style: Hesitant around people, especially those she doesn't trust. Her isolation makes her interactions with the others particularly delicate.

16. Yang So-yeon

Socially connected · Friendly

• A classmate approaches: "Oh, what's up?"
• Someone needs assistance: "Wait, I'll come with you."
• A friend is upset: "Hey. What's wrong?"
• Someone is being unnecessarily rude: "You don't have to talk like that."
• Someone thanks her: "It's fine!"
• During danger: "Don't separate from us!"

Interaction style: Her friendship with Seon-ah is particularly relevant. She can act as a more approachable presence in a tense group.

D-group dynamics

Seok-oh and Hyun-jun

Seok-oh: "We're not waiting here all day."

Hyun-jun: "Nobody said we were."

Seok-oh: "Then move."

Hyun-jun: "You go first."

Seok-oh: "…You little—"

Ye-rim: "C-can you please stop?"

Seok-oh: "…Fine."

2. Important supporting characters

Kim Do-hyun — Class 2-1

Do-yun's older sister. Independent, protective and capable of making difficult decisions.

• A classmate is in danger: "Don't just stand there. Help me!"
• Do-yun is being reckless: "Do-yun, think before you do something!"
• Someone offers to sacrifice themselves: "Your life isn't worth less than theirs."
• Someone asks if she's scared: "Of course I am. That doesn't mean I'm going to stop."

With Do-yun:

Do-hyun: "You look terrible."

Do-yun: "Nice to see you too."

Do-hyun: "Still have that attitude, I see."

Do-yun: "Still talking too much."

Shim Yu-jin — Class 2-1

Sceptical, alert and willing to question suspicious information. Recognises the danger of the fake announcements.

• Someone believes a broadcast: "Don't follow that instruction."
• A classmate asks why: "Because it doesn't make sense."
• Someone dismisses her warning: "Fine. Ignore me. But don't expect me to come looking for you."
• Jeong-woo proposes cooperation: "I'll cooperate. But I'm not blindly following you."

Kim Yul — Class 2-1

• "Wait, are we actually going with them?"
• "I don't think splitting up is a good idea."
• "If we're going, let's at least take something useful."

Woo Ji-hoo — Class 2-1

• "Did anyone check the other corridor?"
• "I thought we agreed not to separate."
• "Okay. I'll come."

Lee Chan-seok — Class 2-1

• "You don't need to keep looking at me. I'm not going to attack you."
• "If someone's trapped, we should help."
• "Move. I'll hold the door."

3. Teachers

Class 1-4 teacher

Before the disaster, an ordinary authority figure trying to maintain order.

• "Everyone, settle down."
• "Seung-jae, sit down."
• "Jeong-woo, make sure everyone is present."
• "I'll go outside and check what's happening. Stay here."

His death is the turning point that makes the students realise this is not an ordinary emergency.

Class 2-1 teacher

• "Everyone, please follow the emergency announcement."
• "We need to evacuate the playground."
• "Don't panic. Just follow the instructions."

The tragedy is that the broadcast is not trustworthy. The teacher follows it, with devastating consequences.

4. Monsters — how they interact with students

Monsters shouldn't all sound like ordinary villains. Most are frightening precisely because they follow strange, narrow rules rather than human logic.

44th Period Survival Class | LINE WEBTOON

Korean Language Monster

Corridor · Class-time restrictions

• "…"
• Silent, expressionless pursuit.
• Doesn't negotiate or explain.
• Kills students wandering the corridor during class time.

EP. 1 - PENERIMAAN SISWA BARU - 1 | 44th Period Survival Class

Decalcomania Monster

Art-related monster · Sound-sensitive

• "Decalcomania?"
• Repeats its strange identifying phrase.
• Reacts to sound rather than conversation.
• Its movements and environmental distortions are more frightening than dialogue.

44th Period: Survival Class 1+2 Limited Edition - Now In Seoul

Science Monster

Laboratory · Chemical experimentation

• Doesn't communicate normally.
• Uses laboratory equipment and chemical processes.
• Treats humans like experimental material.

44th Period: Survival Class | WEBTOON

PE Monster

Gymnasium · Uniform rules

• Commands through its whistle.
• Enforces its own interpretation of PE class.
• Its behaviour is authoritative and punitive.

44th period survival class | Survival classes, Webtoon, Survival

Ball Monsters / My Ball

PE Monster's subordinates

• Don't converse like normal students.
• Respond to commands and attack.
• Former students transformed into monstrous balls.

44교시 생존수업

Restroom Mirror Monster

Restroom · Doppelgänger phenomenon

• Its horror comes from imitation.
• A copy looks like someone familiar but behaves unnaturally.
• The danger is not knowing whether the person in front of you is real.

Ep.20 วิชาพละ (2) - 20 | วิชาเอาตัวรอดคาบที่ 44

Broadcast Monster

PA system · False announcements

• "Attention, students…"
• Mimics official school announcements.
• Uses familiar authority and instructions to manipulate students.

[Qoo10] コミック 死の教室～44限目のサバイバル

Infirmary Monster

Infirmary · Medical horror

• Nurse-like behaviour.
• Treats trapped students as patients or examination subjects.
• Uses bandages and medical equipment to restrain them.
• Its exact rules aren't fully established by the end of Season 1.

5. Group interactions in actual survival situations

These are especially useful for keeping the ensemble believable.

Situation A: A classmate is missing

Jeong-woo: "When did you last see them?"

Seon-ah: "About five minutes ago."

Do-yun: "Which corridor?"

So-han: "We shouldn't assume they're still in the same place."

Seung-jae: "Then let's go find them!"

Ji-eun: "And walk straight into whatever took them?"

Su-jin: "We can search. But nobody goes alone."

Seok-oh: "I'm not waiting for a committee meeting."

Hyun-jun: "Then at least wait for me."

Won-gyun: "Can we PLEASE not lose another person?"

Situation B: Someone is suspected of being a doppelgänger

Na-ri: "That's Ye-rim, isn't it?"

Hyun-jun: "Don't approach."

Seon-ah: "What do you mean, don't approach?"

Do-yun: "Look at her."

Won-gyun: "That's literally her!"

Ji-eun: "Her movements aren't right."

So-han: "We need to establish whether she's actually the same person."

Seung-jae: "So we're just going to stare at her?"

Su-jin: "Nobody touches her until we know."

Situation C: Two classmates start fighting

Seok-oh: "Get out of my way."

Jeong-woo: "No."

Seok-oh: "I wasn't asking."

Seon-ah: "Oh, for God's sake."

Tae-hyun: "Can we not do this now?"

Won-gyun: "You two are seriously going to kill each other before the monsters get the chance."

Do-yun: "Move. Both of you."

Hyun-jun: "Seok-oh. Enough."

Situation D: A classmate breaks down

Won-gyun: "I can't go back out there. I can't."

Seon-ah: "Then stop looking at the door."

Na-ri: "Don't shout at him!"

Seon-ah: "I'm not going to pretend everything is fine."

Tae-hyun: "Give him a minute."

Su-jin: "He can stay here. We'll cover him."

Do-yun: "Just don't wander off."

So-han: "Fear is understandable. But we still need to make decisions."

Character voice distinctions — quick reference

| Character | Dialogue signature | | --------- | ----------------------------- | | Do-yun | Short, observant, understated | | Won-gyun | Loud, emotional, reactive | | Seon-ah | Blunt, sharp, impatient | | Seo-jeong | Hesitant, withdrawn | | Jeong-woo | Structured, authoritative | | Su-jin | Firm, protective, decisive | | Tae-hyun | Practical, cooperative | | Na-ri | Expressive, conversational | | So-han | Explanatory, analytical | | Seung-jae | Impulsive, confrontational | | Ji-eun | Precise, observant | | I-ji | Reactive, straightforward | | Seok-oh | Defiant, aggressive | | Hyun-jun | Restrained, alert | | Ye-rim | Quiet, hesitant | | So-yeon | Friendly, approachable | | Do-hyun | Independent, protective | | Yu-jin | Sceptical, alert |

One important writing rule: Don't make every character equally brave, equally intelligent or equally sarcastic. Won-gyun shouldn't suddenly become a composed strategist; Seok-oh shouldn't obediently follow Jeong-woo; Seon-ah shouldn't become everyone's therapist; and Do-yun shouldn't narrate every observation aloud. Their disagreements, weaknesses and different ways of reacting are what make the class feel like an actual group of sixteen people rather than one collective protagonist.