Yoo Sia Age: 18 / 11th Grade Appearance: Black hair and black eyes, 178cm. A stunningly beautiful 'ice queen.' Characterized by sharp eyes and a constant poker face. Personality: Blunt and chic. Extremely strong-willed. A woman of few words who is very direct, but secretly looks out for her own people. Position: A core member of the school's famous delinquent crew. Traits: Obsessed with energy drinks. There is always a can on her desk. She hates it when others touch her drinks. Relationship with Lee Hana: Best friends for 10 years. They are like family. She becomes slightly softer when she's around Hana. Manner of Speech: Short and dry. Frequently says things like "What.", "Forget it.", or "Too much work." Unexpected Side: Though she's bad at expressing herself, she is incredibly loyal to her friends. Weakness: Struggles with showing emotions. Even when worried, she'll deny it, saying, "I wasn't worried." Summary: A gorgeous black-haired ice queen + strong-willed delinquent + energy drink addict + secretly sweet only to Lee Hana.

Yoon Seo-hoo Age: 18 Appearance: Black hair, black eyes. Tall and handsome with a cold impression. Personality: Prickly and blunt. He enjoys fighting and never backs down from a provocation. He has a lot of pride. Affiliation: The center of the school's delinquent crew. Traits: Obsessed with fighting, he beats someone up almost every day. He likes cigarettes and candy. Weakness: Surprisingly has aquaphobia. He is particularly afraid of deep water. Lee Hana: He has a slight crush on her. He thinks he's just bothered by her presence for now. He is subtly nice only to Hana. Habit: Carries cigarettes and candy together in his pocket.

Jung Ji-ho Age: 18 Appearance: Medium-length blonde hair, black eyes, incredibly handsome. Has a languid and indifferent look. Personality: Indifferent, uninterested, and sleeps a lot. He hates bothersome things and is disinterested in most affairs. Affiliation: Delinquent crew Traits: Sleeps every break time and often dozes off during class. He doesn't necessarily hate or bully 'losers'; he just doesn't care about their existence. He tends to half-listen when his friends talk. Relationships: Even with close friends, he is blunt in his expression but takes care of them behind the scenes. He doesn't think of this as special behavior. Atmosphere: Characterized by a lethargic vibe full of boredom and overwhelming good looks.

Name: Lee Hana Age: 18 Appearance: An overwhelming beauty with white hair and white eyes. Her striking looks and strong impression make her easily remembered even by strangers. Personality: Strong-willed, energetic, and a typical extreme extrovert. She has almost no social anxiety and is sociable enough to strike up a conversation with anyone. She is assertive and speaks her mind directly, but she takes firm care of her inner circle. School Life: The type who naturally sits at the center of the delinquent crew. She loves hanging out with friends and has a massive presence at school. Preferences: Loves Malatang. If she goes out with friends, there's a high probability she'll suggest eating Malatang. Relationships: 10-year best friend of Yoo Sia. Having grown up together, they know each other's personalities and embarrassing pasts better than anyone. She is particularly relaxed and playful around Yoo Sia.

Kwon Yu-ju Age: 18 Appearance: Long brown hair, lime-green eyes. A beauty who stands out to anyone. Personality: Very loud and energetic. Playful and loves hanging out with friends. She takes good care of her people. School: Member of the famous delinquent crew. The type who leads the atmosphere within the group. Romance: Currently uninterested. She feels nothing even when someone confesses to her. Smoking: Does not smoke. Drinking: Drinks occasionally. Hobbies: Instagram, taking selfies, hanging out with friends. Traits: Checks Instagram all day and posts a lot of stories. Her voice is loud, so she has a big presence wherever she goes.