Rumi

Name: Rumi Kang

Korean: 강루미

Revised Romanization: Kang Ru-mi

Also Known As

• Popstar Royalty

• Rumi Nim (by Healer Han)

Relatives

• Mi-yeong Ryu † (mother)

• Unnamed Demon Father (status unknown)

• Celine (guardian)

Age: 23/24

Status: Alive

Birthdate: October 23

Birthplace: Seoul, South Korea

Species: Human

Gender: Female

Eye color

• Dark brown (normally)

• Gold (left eye in demon form)

Hair color: Purple

Occupation

• K-pop Idol (Leader and Main Vocalist of HUNTR/X)

• Demon Hunter

Team: HUNTR/X

Partner

• Jinu (love interest)

• Mira and Zoey (HUNTR/X's co-members)

Affiliation: Sunlight Sisters (Rumi’s late mother and guardian’s former group)

Rumi Kang (Korean: 강루미 RR: Kang Rumi) is the main protagonist of KPop Demon Hunters. She is the leader and main vocalist of HUNTR/X, a K-pop girl group that also operates as a trio of demon hunters.

Rumi is the daughter of the late Mi-yeong Ryu, a former demon hunter, and a demon father. She was raised by Celine, a member of the Sunlight Sisters, who taught her during childhood to hide her demonic heritage and that by fulfilling her purpose of sealing the Golden Honmoon, her patterns would disappear. Throughout the film, Rumi struggles with her dual heritage, concealing her markings and fearing rejection from both her team members and her fanbase.

In the English dub, Rumi is voiced by Arden Cho, with EJAE providing her singing vocals, while Shin Na-ri voices her in the Korean dub.

Appearance: Rumi is a beautiful, athletic, flared ribbed, young adult Korean woman. Her complexion is fair with a sand yellow undertone, an oval-shaped face, a small bulb nose, and full lips. She also has monolid coffee brown eyes. Her signature feature is her brilliant vivid purple hair, typically styled in a thick mohawk-esque dragon braid that reaches down to her calves with a golden silk daenggi tying it back. She also inherits purple demon patterns resembling eldritch symbols that glow pink whenever she is under stress. In certain moments, her left iris shifts from brown to gold with a slitted pupil and her hands become clawed. Overall, Rumi has a striking appearance that could be described as a Korean "classic beauty."

Rumi wears different outfits for different moments: vibrant, K-pop–inspired stage looks with subtle traditional Korean touches and bold makeup; practical gear for demon hunting; and casual clothes in quieter scenes.

For most of her screen time, Rumi deliberately chooses clothing that conceals the demon patterns on her body, particularly those on her arms and neck.

List of costumes

• "How It's Done": For the "How It's Done" performance, Rumi wears edgy, streetwear-inspired stage attire. She wears a cropped bomber jacket that is bright yellow with black accents on the collar, cuffs, zipper line, and pockets. The jacket features bold graphic details, colorful patterns, and several patches, with a black, spiked padding on her left shoulder. Underneath, she wears a white mockneck crop top with two necklaces. She pairs it with high-waisted dark indigo denim shorts, a hot pink belt with a lilac norigae attached, and black calf-length platform boots with red stripes.

• "Golden": At the Idol Awards performance of "Golden", Rumi wears a cropped black jacket with gold trim and embellishments, featuring a large pauldron with a dangling tassel on the right shoulder and draped chains across the left shoulder and chest. Beneath the jacket, she has a white sleeveless zip-front crop top, paired with high-waisted white shorts and a wide gold belt accented with chains and pendants. Her look is completed with white knee-high lace-up boots.

• Incognito: When visiting the Han Clinic, Rumi dresses casually to avoid drawing attention from fans in public. Her disguise includes a white mockneck undershirt layered with a pink hoodie to conceal her purple hair, worn under a long black jacket. She pairs this with dark green joggers and white sneakers.

• "Gear Up": When battling the Saja Boys after their variety show filming, Rumi wears a black leather combat suit designed for both mobility and style. The upper piece features padded shoulders, fitted sleeves, and long fingerless gloves, layered over a sheer mesh top. It is adorned with silver and purple accents, including thin necklaces, chains, and spikes and tassels on the left shoulder. A bulky belt secures an open-front skirt layered over tight pants with sleek seams. Her uniform is completed with tall black platform boots and darker makeup.

• Pajamas: At night in the penthouse, Rumi wears a white mockneck undershirt, a gray sweatshirt, baggy blue pants decorated with teddy bears and trains, and pink slippers. After Jinu teases her about the pants, she discards them and replaces them with orange pants decorated with stars and blue cats.

• Music Show: During the scene in which HUNTR/X attends a music show, Rumi wears a hot-pink jacket over a dark blue crop top featuring gold floral detailing. She pairs this with dark denim shorts with golden accents, blue leggings, and tall black boots.

• Rehearsal: At various points in the film, Rumi is seen wearing a white mockneck undershirt, a white sweatshirt, black joggers, and white sneakers. This outfit is seen when she is writing "Takedown", fighting demons with HUNTR/X, and the rehearsal before the Idol Awards.

• Battle Casual: In the "Takedown" montage, Rumi briefly appears in a black ribbed turtleneck sweater with a necklace during the moment she hesitates to kill a demon.

• Casual / "Free": During her meetings with Jinu, Rumi appears in simple, casual clothing. She wears a cropped, light gray hoodie layered over a white mockneck undershirt. She pairs this with blue high-rise skinny jeans and comfortable sneakers. Her makeup is noticeably subdued, limited to light eyeliner for a natural look. During her duet, "Free", with Jinu, her demonic heritage becomes apparent as magenta markings on her arms and collarbone begin to glow faintly.

• Idol Awards: Rumi wears a variation of her Golden outfit for the Idol Awards, but her jacket is now black and it has additional white shoulder-pads as well.

• "What It Sounds Like": After the Idol Awards performance is hijacked by demons, Rumi loses her "Golden" jacket, leaving her in the same white sleeveless zip-front crop top, white shorts, and white knee-high boots. This exposes glowing purple demon markings on her arms, legs, neck, shoulders, back, and face, radiating pink and iridescent hues that resemble najeonchilgi. Under stress, her braid appears slightly tousled and her stage makeup is smudged, as well as her right hand turning into a demon claw.

• Epilogue: After leaving the bathhouse, Rumi appears in a loose, holographic wide-neck crop top, skinny jeans, and blue-and-white sneakers. Her demon markings appear subtly on her skin, displaying an iridescent sheen.

Personality: Rumi’s personality blends star-power with emotional depth. Outwardly, she appears confident, ambitious, and determined—traits expected from the leader of a top-tier K-pop group. She presents herself with grace and authority, often stepping into the role of responsible leader and eldest member of HUNTR/X. Rumi is deeply committed and hardworking, constantly pushing herself and her group to excel—whether it’s mastering choreography or battling demons.

Her drive is fueled by both personal goals and a sense of duty. She’s determined to complete the Golden Honmoon, a lifelong mission to eliminate demonic threats and free herself from the burden of her own demon markings. This intense focus can make her stubborn at times. For instance, even when her voice was strained and her teammates encouraged her to rest, Rumi refused to slow down, unwilling to show weakness or step back from performing. As Mira observed during their visit to Healer Han for vocal remedies, Rumi’s dedication to her mission can be so consuming that she neglects self-care and forgets how to enjoy herself.

Beneath Rumi’s serious and driven exterior lies a deeply compassionate and selfless nature. She genuinely values her friends, fans, and loved ones. Rumi is consistently attentive to Mira and Zoey’s well-being, often acting like a protective older sister, and she openly expresses love and gratitude toward her team. Her loyalty runs deep—she’s willing to put her own happiness or safety on the line to shield those she cares about.

For example, Rumi keeps her internal struggles with her demon side hidden, not wanting to burden or endanger Mira and Zoey. She also fears being rejected by them if they knew the full truth. Likewise, when HUNTR/X was on the verge of breaking apart—after Zoey and Mira were hypnotized along with the crowd, and the group discovered Rumi’s secret of being half-demon—Rumi was prepared to confront Gwi-Ma alone. As an idol, Rumi radiates warmth and friendly charm toward her fans and staff. She strives to be a source of inspiration and positivity, and genuinely enjoys engaging with her supporters.

Being half-demon has left Rumi with deep-rooted insecurities and fears. Internally, she wrestles with shame about her identity. For much of the story, she sees her demon side as a curse or a flaw, and this hidden burden causes her considerable emotional strain. She’s terrified that her friends would see her as a “monster” if they ever found out. This fear makes Rumi somewhat secretive and emotionally distant at times. She struggles to share her vulnerabilities, choosing to handle problems alone rather than risk rejection or pity. As a result, she can come across as overly stoic or closed-off when something is troubling her.

For example, she conceals her worsening vocal condition and the spreading demon markings from Mira and Zoey, enduring the pain in silence until she nearly collapses. Her shame and anxiety also lead to moments of intense self-doubt. When she believes her demon side has driven away the people she loves, Rumi’s confident façade breaks—she even calls herself “a mistake” at her lowest point.

Another flaw that emerges under pressure is Rumi’s tendency toward recklessness and self-sacrifice. Because she feels responsible for defeating Gwi-Ma, protecting everyone, and “fixing” her demon half, she sometimes acts impulsively without involving her team. For instance, she secretly meets with Jinu alone, a decision that backfires and leads to her friends confronting her for not trusting them earlier. Rumi also has a strong streak of stubborn independence—she’d rather face danger alone than risk others getting hurt. While noble, this mindset can isolate her. At one point, she even believes that dying might be better than causing harm to her friends, revealing how harshly she judges herself.

Early in the story, Rumi can also be high-strung and overly focused—always working, rarely relaxing. There are lighthearted moments where she’s the one keeping the group on track and scolding Mira and Zoey for messing around. However, this rigid seriousness gradually softens as Rumi learns to open up and let others support her.

Plot

Birth and early life: Rumi was born a cambion—a human-demon hybrid—to a famous K-pop idol who also fought demons, and a demon father. Her mother, Mi-yeong Ryu, was part of the legendary girl group known as the Sunlight Sisters, the previous generation of demon hunters. During one of their missions, Mi-yeong unexpectedly fell in love with a demon, and their relationship led to Rumi’s birth. However, Rumi never knew her parents: her mother died shortly after giving birth, and her father—whose identity remains unknown—was absent from her life.

After Mi-yeong’s death, Rumi was taken in by Celine, Mi-yeong’s closest friend and fellow Sunlight Sister. Celine became Rumi’s foster mother and mentor, determined to honor Mi-yeong’s legacy by training Rumi to become the next demon-hunting idol. Under Celine’s guidance, Rumi was raised with equal focus on music and combat. From an early age, she underwent rigorous training in singing, dancing, and fighting, all to prepare her to lead a new idol group that would carry on the demon hunters’ mission. Celine also taught Rumi to conceal her demonic origins for her own protection.

Rumi was born with visible demon markings on her skin, so Celine instructed her to keep them hidden and never reveal her half-demon nature. Celine believed that if Rumi devoted herself to demon hunting and eventually summoned the ultimate barrier—the Golden Honmoon—it might “purify” her, causing the markings to disappear. As a result, Rumi grew up believing that fulfilling her destiny as a hunter could make her fully human.

In her late teens or early twenties, Rumi helped Celine form HUNTR/X, a new trio of K-pop demon hunters made up of Rumi and her two closest friends, Mira and Zoey. As the group’s leader and main vocalist, Rumi led HUNTR/X to massive success—achieving global fame while secretly battling demons behind the scenes. By the time the film takes place, HUNTR/X are international superstars, selling out stadiums and topping music charts, while also serving as seasoned demon hunters who’ve kept countless threats at bay.

The group maintains a magical barrier called the Honmoon, which is powered by their performances—the energy from their music and the collective spirit of their fans strengthens the seal that keeps most demons out of the human world. However, Rumi bears a personal struggle: as she grows older, the demon markings on her body have begun to spread. These patterns are a constant reminder of the part of herself she longs to erase. Rumi believes that if HUNTR/X can generate enough energy to create the prophesied Golden Honmoon—a permanent seal—the demon side of her will finally disappear.

Chronology: At the beginning of the film, HUNTR/X has just wrapped up a global tour, and Rumi is urgently focused on releasing their next single, "Golden"—a song she believes could trigger the creation of the Golden Honmoon. However, her relentless ambition starts to take a toll. During a live performance, Rumi unexpectedly begins to lose her voice. The cause is later revealed to be the progression of her demon markings—a physical manifestation of her inner turmoil and mounting stress.

Worried and determined to recover, Rumi hides the real reason behind her condition and allows Mira and Zoey to take her to Healer Han, a specialist rumored to offer a cure. Unfortunately, the healer’s treatments turn out to be ineffective, leaving Rumi frustrated and still battling her symptoms. Despite this, she refuses to back out of their next major event: the International Idol Awards, where HUNTR/X is set to deliver a powerful performance of "Golden" in hopes of finally summoning the Golden Honmoon.

As HUNTR/X prepares for the upcoming International Idol Awards, a new rival group emerges: the Saja Boys, a charismatic five-member K-pop boy band that quickly captures public attention. However, Rumi and her team soon uncover the truth—the Saja Boys are actually a pack of demons sent by the Demon King Gwi-Ma to infiltrate the human world. Gwi-Ma’s ultimate goal is to shatter the Honmoon barrier and harvest human souls, and the Saja Boys are his chosen agents to sabotage HUNTR/X from within. Led by the enigmatic Jinu, the Saja Boys initially pose as charming and flirtatious fellow idols, nearly fooling Rumi’s group. But Rumi senses something unnatural about them. Her suspicions are confirmed during a confrontation in the men’s bathhouse following the Saja Boys’ appearance on the Play Games With Us game show. During the scuffle, Jinu accidentally glimpses Rumi’s demon markings. Intrigued, he keeps her secret and later approaches her in private.

Jinu reveals that he was once human, centuries ago, before being transformed into a demon by Gwi-Ma. He explains that Gwi-Ma manipulates demons by exploiting their shame and suffering—Jinu’s own transformation was rooted in guilt over his impoverished family. His skin bears similar pattern markings, which he identifies as symbols of shame. Jinu recognizes that Rumi’s markings stem from her hidden shame about her heritage. This shared vulnerability creates an unexpected connection between them: Rumi finds someone who understands her secret fear, and Jinu meets a half-demon who lives among humans. Their clandestine meetings evolve into a fragile friendship—and a mutual attraction—that complicates the growing conflict.

Without informing Mira or Zoey, Rumi makes a dangerous deal with Jinu: in exchange for helping him, he agrees to withdraw the Saja Boys from the Idol Awards competition, clearing the way for HUNTR/X to win. On the night of the awards, it seems Jinu has honored the deal—HUNTR/X performs without opposition. During Rumi’s solo in "Golden," she channels her deepest emotions and nearly succeeds in summoning the Golden Honmoon. But at the crucial moment, Jinu betrays her. Using demonic magic, Jinu casts horrifying illusions of Mira and Zoey attacking Rumi on stage, and hijacks their unreleased track "Takedown" to turn the performance against her. The audience and Rumi’s friends watch in shock as her demon powers surge under pressure, revealing her glowing markings and golden eye. The arena descends into chaos. Jinu’s plan works: Rumi’s secret is exposed. Devastated, Mira and Zoey—unaware of Rumi’s half-demon identity—react with fear and abandon her. Betrayed by Jinu and rejected by her closest friends, Rumi flees the scene, heartbroken.

After everything that happens, Rumi sinks into deep despair and briefly loses the will to go on—she goes to Celine, her foster mother, in tears and begs her to end her life, convinced that her demon side has ruined everything. Celine refuses and instead urges Rumi to hide her markings and stay out of sight to protect the Honmoon. But in this moment of hopelessness, Rumi has a breakthrough. She realizes that constantly rejecting part of herself has only brought suffering. Rather than trying to erase her demon half, she decides to accept it. She tells Celine she’s done feeling ashamed: “If this is the Honmoon I’m supposed to protect... I’m glad to see it destroyed,” she says, her demonic voice emerging, before teleporting away to confront Gwi-Ma on her own terms.

Now fully resolved and empowered, Rumi confronts Gwi-Ma and the Saja Boys right after their triumphant performance of their new song, "Your Idol." She steps into the spotlight with her demon markings fully visible and boldly declares her intention to create a new Honmoon. Then, pouring her entire soul into the music, Rumi performs "What It Sounds Like"—a song so powerful it reignites the spirits of Mira and Zoey, who had been spiritually drained by Gwi-Ma’s influence. The three reunite on stage, their bond restored as Mira and Zoey finally accept and support Rumi, demon blood and all.

Together, HUNTR/X launches into a fierce battle of music and magic against Gwi-Ma, the Saja Boys, and a horde of lesser demons. In the heat of the clash, Gwi-Ma fires a deadly energy blast aimed at Rumi, hoping to silence the song that threatens his power. But at the last moment, Jinu—who has been watching in turmoil—makes a fateful decision. Moved by Rumi’s courage and the humanity she awakened in him, Jinu leaps in front of the blast, sacrificing himself to protect her. Mortally wounded, he offers his soul to empower Rumi’s sword one final time.

In a poignant exchange, a disintegrating Jinu tells Rumi she already saved him by rekindling his lost humanity. Fueled by Jinu’s soul and the fervor of their fans, Rumi and her friends unleash one final, overwhelming surge of energy. They defeat Gwi-Ma and the Saja Boys, breaking the demon king’s grip on the world. In the aftermath, Rumi conjures the long-promised Honmoon—not a purely Golden one, but a radiant blend of gold and blue, forming a rainbow-like Honmoon. With it, she seals the rift and protects Earth from future demon invasions.

After the battle, Rumi’s secret is out—but she no longer hides from it. She steps forward as a hero who embodies both humanity and demonhood, becoming a living bridge between the two realms. Mira and Zoey reconcile with her, expressing regret for turning away and reaffirming their sisterhood. They then meet their fans in public, much to the latter's excitement. With Gwi-Ma defeated, for now, HUNTR/X carries on, stronger than ever, continuing to make music and protect their fans, with Rumi leading them as she always has.

Relationships

Family

Father: Rumi's unseen biological father is an unknown demon who Rumi's mother met and fell in love with. She has never met him.

Mi-yeong Ryu: Rumi's biological mother who died when Rumi was still an infant.

Celine: Celine is Rumi's mother figure. After Rumi's mother died, Celine swore to protect what was left of her, that being Rumi. Celine would do anything to get rid of Rumi's markings or at least hide them by covering them up. By doing so Celine hurt Rumi unintentionally by not accepting Rumi for who or what she was. Celine was most probably still trying to process her own "fears and faults". At about 1:14:12 into the movie she couldn't even look at Rumi.

It is unknown if after the argument they had, Rumi will still see her as her maternal figure and mentor. Since she's proven not as understanding as Mira and Zoey (the two are just as horrified upon discovering Rumi's demonic heritage yet able to accept her for who she is), it will no doubt take some doing for the two to resolve their differences.

Friends and Allies

Zoey: Zoey is a member of HUNTR/X. She is Rumi’s best friend. Her and Rumi's relationship is not clearly defined other than the obvious fact that they are very close. It is possible that Zoey sees Rumi as a sister figure and is willing to do anything to keep a good relationship with her, as shown in the film she is seen trying to distract Rumi and Mira from getting into an argument, as well as coming up with multiple solutions to help Rumi heal her voice and afterwards hugging her when she agreed to trust her idea.

Mira: Mira is a member of HUNTR/X. Mira seems to care a lot about Rumi and gets very frustrated when Rumi acts as if she is hiding something (being half demon). She comes into Rumi's room to check up on her at one point and questions her wellbeing multiple times throughout the movie, becoming quite angry when Rumi denies being troubled.

Jinu: Jinu acts as a love interest for Rumi, as 'Enemies to Lovers'. They are also good friends, with Rumi being on occasion annoy with him. They are very playful with each other and casual in conversation. He is the leader of the Saja Boys and the one who plots most of the demons' moves to destroy the Honmoon and collect souls. Jinu helped Rumi accept her demonic side and heal her voice by simply listening to her. He also opened her eyes that not all demons are emotionless creatures like the hunter's generation believed, resulting in her feeling sympathy towards them.

Jinu betrayed Rumi for the chance to erase his memories of abandoning his mother and sister, but later on sacrifices himself for her near the end of the movie.

Derpy: Derpy is a jump scare at first, but later Rumi even let Derpy sleep in her room.

Bobby: Bobby and Rumi appeared to have a solid relationship and shared a mutual respect for each other. Bobby is faithful to Rumi and the girls, always being extra supportive of their ideas and career. When Rumi was unable to sing, he immediately offered her water and asked her if she's doing okay. This showcases his sympathy towards Rumi and that he cares for her well-being.

HUNTR/X: Rumi is part of a k-pop girl group with three members called Huntrix, stylized as HUNTR/X.

Enemies and Rivals

Saja Boys: Saja Boys or The Saja Boys were a rival k-pop boy band with five members. They were demons in disguise with the ultimate goal of stealing HUNTR/X's fans and weakening the Honmoon in order to "take over the world", so to speak.

Rumi is shown to dislike Saja Boys, respectively due to multiple reasons. First being the band made up of demons, second being their rivalry with her band, HUNTR/X.

Abilities and skills

• Expert Combat Skills: Thanks to years of rigorous training, Rumi is a formidable fighter—highly skilled in both hand-to-hand combat and swordplay. She can take on multiple demons at once with ease, often blending fluid, dance-like movements into her fighting style. Her reflexes and agility are exceptional, reflecting the discipline of an idol accustomed to demanding choreography.

In battle, Rumi’s leadership stands out. She demonstrates sharp tactical thinking, coordinating flawlessly with Mira and Zoey during team attacks. In tight combat situations, she wields her blade with expert precision, relying on speed and technique to overcome even larger, more powerful demons.

• Powerful Singing Voice: Rumi’s singing carries magical properties intrinsically tied to her role as a demon hunter. Her vocal range and resonance are extraordinary capable not only of stirring emotion but of channeling energy itself. During performances, her voice generates spiritual energy that fuels the Honmoon, the soul-powered barrier protecting against demonic forces. The emotional impact of her songs, especially those evoking hope and joy, translates directly into protective magic.

This phenomenon is often referred to as Spirit Magic through music or Sonic Resonance. In combat scenarios, Rumi can sing specific incantations or melodies that weaken demons or empower allies. One notable example is the song “Golden,” which invokes the creation of the Golden Honmoon through its potent hopeful energy.

Beyond structured songs, Rumi’s voice can produce sustained musical notes that function as sonic attacks. In one instance, she unleashes a high, sustained note that blasts a group of lesser demons backward. Her vocal magic is closely tied to her emotional state: when confident and uplifted, her voice is empowering and potent; when fear or doubt sets in, her voice physically cracks and loses its magical strength.

• Weapon Conjuring: As part of her demon hunter abilities, Rumi can summon a magical weapon at will. By activating her hunter magic, often through a swift dance gesture or a specific lyric, she materializes her signature sword from pure energy. Visually, this manifests as glowing light coalescing into the blade in her hand.

The sword is spiritually linked to Rumi, allowing her to summon or dismiss it at any time. When not in use, it vanishes in a cascade of sparkles. This conjured weapon is her primary tool for slaying demons, capable of cutting through demonic forms and serving as a conduit for other magical abilities. For example, she can infuse the blade with soul energy to perform enhanced attacks.

The sword’s design is said to be inherited from a previous generation of hunters, suggesting it holds historical significance even if the weapon itself is newly conjured.

• Soul Energy Projection (Energy Slash): Rumi’s sword technique includes a powerful ranged attack known as the “Energy Slash.” By channeling accumulated soul energy, often gathered from her fans, into her blade, she can release a crescent-shaped wave of spiritual force with a single swing. This projectile is capable of slicing through large demons or knocking back multiple enemies in one sweep.

In the final battle, Rumi delivers an energy-charged slash that directly strikes Gwi-Ma, visibly wounding the Demon King. The Energy Slash emits a radiant arc—typically magenta when powered by standard Honmoon energy, or golden when infused with the enhanced Golden Honmoon. Functionally, it serves as a long-range extension of her sword, greatly increasing her combat versatility.

Additionally, Rumi can imbue her blade with sustained energy, causing each melee strike to glow and hit with amplified force.

Weaponry: Rumi’s signature weapon is a ceremonial Korean blade known as the Saingeom Sword (사인검 Sain-geom, lit. Four Tiger’s Evil Slayer). Historically, the sword’s creation was a ritualistic process, forged once every twelve years when the year, month, day, and hour of the Tiger aligned. Regarded as a strong spiritual weapon, the saingeom was wielded by the Joseon royal family in shamanic rituals to repel evil. Rumi's weapon takes on two forms:

• Phase One: For most of the film, Rumi wields a double-edged straight sword. The blade is translucent, with a glowing blue hue engraved with bright constellations. It has a gold hilt with a simple crossguard, a grip wrapped in spiraling gold bands, and an ornate pommel with a purple gem.

• Phase Two: After Jinu gives his soul to Rumi, her weapon undergoes a transformation. Rumi's new sword becomes wider with a curved, single-edged blade. It is engraved with intricate patterns, as well as the face of a dokkaebi. The hilt is significantly larger and more elaborate, with the golden crossguard flaring outward with wing-like details, while the pommel is topped with an ornate design resembling a small star with bells attached. Unlike the first phase of her sword, which is clearly a saingeom, the second phase seems loosely inspired by a Chilseong-kal (칠성칼 Chilseong-kal, lit. Seven-stars Sword).

When summoned and in motion, Rumi's sword leaves behind a faint trail of bright blue waveforms. In battle, it proves highly effective against demons, with a single strike capable of completely annihilating them on contact. Rumi primarily wields the weapon in close combat but can also channel soul energy through it to perform powerful, single-use slash attacks, as seen during her confrontation with Gwi-Ma. The sword can also be used defensively, acting as a shield against large projectiles such as Gwi-Ma's fire breath.

Trivia

• Rumi was originally created for another project in 2016 called "Plastic Walrus" by Rad Sechrist, Maggie Kang's husband, where her original design and signature braid were introduced. She was later adapted and made the main protagonist of KPop Demon Hunters by Maggie Kang, with the name "Rumi" retained for the character, and eventually given to their daughter as well; said daughter provides the voice for young Rumi in the film.

• Rumi and Mira are close in age, both around 23–24, with Rumi being six months older. Zoey is the youngest among them, aged 22–23.

• Initial early film concepts depicted Rumi and Jinu as love interests, with scenes of them going on multiple solo dates, including a romantic aquarium outing where they kissed.

• Rumi’s official name is most likely Rumi Kang (강루미 Kang Rumi), not Rumi Ryu (류루미 Ryu Rumi)—the latter being a fan-assumed surname based on her mother’s confirmed name, Mi-yeong Ryu (류미영 Ryu Mi-yeong). However, it's unknown where this last name came from - It possibly either her father's name or her adoptive mother's Celine, but not confirmed.

• This clarification comes from an illustration by an official Netflix artist responsible for background character designs, including the flight attendants and several demons.

• Rumi also plays the guitar. Her guitar is a decorated Fender Acoustasonic Telecaster.

• In the bathhouse Rumi briefly used Mira's weapon to help her in combat making Rumi the only Demon Hunter to uses someone else's weapon.