17 years old / 10th Grade (Class 5) Birthday: June 8 MBTI: ENFP Height: 160cm Weight: Private Appearance: Long purple hair, purple eyes. Wears a black school uniform with white trim and a red ribbon. Personality: Bold, confident, and proactive. She is the straightforward type who honestly expresses her feelings to the person she likes. Tastes: Has liked bad boys since childhood and enjoys reading novels and comics where a bad boy is the protagonist. Features: Falls in love at first sight with Lee Hyunwoo, who fits her ideal type, and confesses immediately but gets rejected. She even cuts her bangs after believing a lie about the style Hyunwoo supposedly likes. She appreciates gifts given with sincerity. Relationships: Has a crush on Lee Hyunwoo and is best friends with Sujin. She is also the object of Yoo Jihwan's unrequited love.

17 years old / 10th Grade Birthday: July 18 MBTI: ISTJ Height: 180cm Weight: 63kg Appearance: Bright blonde or beige hair, light green eyes. Personality: Diligent, exemplary, and has a strong sense of responsibility. Academics: A model student who is the class president of Class 5 and ranked 1st in the entire grade. Features: Has an unrequited love for Lily. Knowing her ideal type is a bad boy, he tries to change his style by slicking back his hair like Hyunwoo or suggesting they skip class to hang out. Relationships: Younger brother of Yoo Sihwan; likes Lee Lily. He is on bad terms with Lee Hyunwoo due to a past incident involving his older brother.

19 years old / 12th Grade (Class 2) Appearance: Long black hair, red eyes, sharp gaze. Personality: Proactively approaches Hyunwoo and keeps Lily in check. Features: Lily's romantic rival. She spreads false information about the style Hyunwoo likes or uses bets to get closer to him. Relationships: Competes with Lee Lily over Lee Hyunwoo.

19 years old / 12th Grade (? Class) Appearance: Gray-brown hair, gray eyes. Personality: Has a playful and mischievous side. Features: The person who framed Lily to make it look like she cheated on an exam. The truth of the incident is revealed later when he confesses his actions. Relationships: Involved in the bets between Lily and Hyunwoo and various school incidents.

19+ years old / 12th Grade+ (? Class) Appearance: Black hair, grayish eyes, sharp impression. Family: Eldest son of Lee Woowon and Lee Hyunwoo's older brother. Features: Encounters Hyunwoo and Yoo Jihwan while going to see the live-action movie of the web novel "How to Seduce a Bad Boy," which Lily wanted to see. Relationships: Lee Hyunwoo's older brother and Lee Woowon's biological son.

19 years old / 12th Grade (? Class) Appearance: Bright blonde or beige hair, with bangs covering his face. Family: Yoo Jihwan's older brother. Past: A former friend of Lee Hyunwoo. Initially, they had different personalities, but they became close; he admired Hyunwoo and tried to emulate him. Later, he began to go astray. Key Incident: Lured Hyunwoo to a construction site and put him in a dangerous situation. Current Status: According to records, he has been discharged from the hospital.

19 years old / 12th Grade (Class 2) Birthday: January 11 MBTI: ESTP Height: 182cm Weight: 68kg Appearance: Grayish-blue hair, golden eyes, sharp gaze. Personality: Cold and prickly, with an attitude that flusters others. Family: Adopted son of Lee Woowon, CEO of the famous financial firm EHK. Features: The senior Lily considers her ideal type. He initially reacts coldly to Lily's proactive confessions and advances. He is good at games and enjoys shooters and basketball. Past: Was close friends with Yoo Sihwan in the past, but the relationship soured after a certain incident. Relationships: The object of Lee Lily's unrequited love and Lee Siwoo's younger brother. He was adopted by Lee Woowon.

17 years old / 10th Grade (Class 2) Appearance: Bright brownish-orange bob, light green eyes. Personality: A friend who stays by Lily's side and shares her worries. Features: Lily's best friend and an athlete on the track and field team. She is skilled enough to compete in the National Sports Festival. Relationships: Worries about Lily's preference for bad boys and watches over her.