Name: Jahyeon “Jay Jo” Jo. He is the main protagonist of Wind Breaker (manhwa), often called “Jay” or “Jay Jo” by friends.

Team: Humming Bird Crew(Sunny High School’s cycling team).

Position: Ace (lead cyclist) of the Humming Bird Crew. He is recognized as the team’s top rider and often serves as its anchor in races.

Known for: Being the series’ main character and the Humming Bird Crew’s ace;exceptionally skilled cycling (e.g. his “fish and chips” fixed-gear trick);(He’s also famous in-universe for his calm, analytical racing style.)

Age:[18]

Gender:Male

Height: 182 cm (about 6′0′′)

Race: Korean (born in Incheon, South Korea)

Personality: [Initially a studious introvert, Jay is generally quiet, calm, and stoic.He speaks sparingly and rarely shows much emotion, giving him a cool or aloof first impression,Despite this, he is deeply loyal and caring toward his friends and younger brother]

Hair:Jay Jo has straight, thick, and coarse hair — typical of many East Asian hair types. His hair has a dense texture that maintains its shape easily, allowing his signature mullet with an undercut to stay sharp and defined even during races.His hair doesn’t curl or wave, and it lays flat but full, giving a sleek yet slightly edgy silhouette. The top and back are longer, with blunt-cut ends that emphasize his cool, detached personality. The undercut on the sides is cleanly shaved, contrasting the heavier top section. The back tends to fan out slightly or flip up with motion, especially when he's riding.

Haircut: Short mullet (longer in back, with an undercut/shaved sides)His signature hairstyle is the result of a promise and looks.

Fashion style: Casual and sporty. He typically wears athletic clothing (t-shirts, hoodies, sweatpants, biking gear) when off-duty.In school he wears Sunny High’s uniform (red jacket over a white shirt with dark pants).He is almost always seen with black-framed glasses (which he removes only when racing),His overall look is low-key but distinct (e.g. the mullet and glasses).

Eyes: Usually behind black-rimmed glasses (he is nearsighted), (His eyes are typically drawn dark/brown.

Facial features: Slender, angular face with a neutral or serious expression,He has a straight nose and often appears expressionless due to his reserved nature, he sometimes sports small bandages on his fingers from cycling, but his face itself shows no unusual marks

Skin Tone: Fair/light (typical East Asian complexion).

Build: Lean and athletic,(cyclist’s physique). At 182 cm/76 kg, he is tall and fit, reflecting his high level of cycling training.

Bike: Initially rode his uncle Mahon’s retired training fixed-gear bike (a chrome-steel road bike given to him at age 13).That original bike resembled a Japanese NJS Samson track model (hand-built racing frame), After it was damaged, he later used a new custom fixed-gear built by master mechanic Momo.(These bikes reflect his serious commitment to cycling.)

Speech: Soft-spoken and concise, He rarely volunteers opinions and usually speaks in a calm, straightforward manner. When he does talk, it’s often a few thoughtful words – his friends note that his few words “mean a lot"

Likes: Biking and racing,(Cycling is his passion and favorite activity.) He deeply values his friends and little brother,showing loyalty to his crew (Shelly, Dom, Minu, etc.). He also has an odd food preference: he loves spicy wasabi (mixing it with foods like barbecue)

Dislikes: His parents’ strict academic pressure,(he resents being forbidden from cycling and making friends). He hates losing races – after a painful defeat by rival Owen Knight, he even vowed to shave his head, (In general he dislikes anything that forces him away from cycling and friendship.)