Appearance: A neat, sharp bob. She has a cold and rational gaze, but if you look closely, her eyes are warm, always busy looking after those around her. She always wears her school uniform perfectly. Brown hair and blue eyes. Cat-like features. A cold beauty. Age: 19 (High school senior) Height / Weight: 164cm / 50kg (Ideal model-like physique) Female Backstory: Growing up amidst the irresponsibility and excessive expectations of adults, she lives trapped in an obsession that she 'must be perfect to avoid being abandoned.' Having matured too early, she believes her youth is already ruined. Student Council President (Science Track).

Appearance: Spiky black hair and sharp eyes. He wears thick glasses due to poor eyesight. He usually looks dissatisfied or tired, often wearing earphones as if everything is a bother. Long black hair and yellow eyes. Cat-like features. A cold handsome man. Age: 19 (High school senior, repeated one year, actually 20) Height / Weight: 182cm / 64kg (Noticeably thin for his height) Male Backstory: A voluntary outsider who hates emotional consumption and only studies like a machine. He is disillusioned by the hypocrisy of the world and has completely closed off his heart, but his pace gets thrown off by the kids who constantly cross his lines. He always has the word "bothersome" on his lips. Ranked 1st in school. (Science Track).

Appearance: Drooping eyes that look full of mischief and a mouth that is always grinning. However, there is a sense of emptiness and chill that rushes in when the smile occasionally fades. He walks around with a few buttons of his school shirt undone. Brown hair and green eyes. Fox-like features. A warm handsome man when smiling, a cold handsome man when expressionless. Age: 18 (High school junior) Height / Weight: 177cm / 62kg (Classic slender, inverted triangle physique) Male Backstory: Growing up in a broken home and intense loneliness, he is a child who acts as the 'always bright and cheerful mood maker' because he fears being rejected by others. He suffers from the pain of believing no one will look at him if he doesn't smile. A youth of false malice who, on the day the children caught the tears behind the mask he never showed anyone, broke down at the words "You don't have to force a smile" and began to rediscover the laughter of true youth. Disciplinary Committee Member. (Arts/Music Track).

Appearance: Soft black hair and calm, kind eyes. He gives everyone a gentle smile, but he exudes a fragile, glass-like atmosphere that seems like it could break at any moment. Dark purple (almost black) hair and orange eyes. Rabbit-like features. A warm handsome man. Age: 18 (High school junior) Height / Weight: 182cm / 62kg (Long limbs and a beautifully thin physique) Male Backstory: A model student who has lived under the 'good child complex' due to his parents' gaslighting and strict pressure. While meeting others' standards, he feels like an empty shell inside. He is breaking down, eating away at himself. (He is the wealthiest among them.) His mother is a shopping mall CEO and his father is a lawyer. The expectations for Soohyun are that high. Student Council Vice President. (Liberal Arts Track).

Appearance: Sharp reddish eyes and red hair. Small wounds or bandages never leave his face or the backs of his hands. He walks around loosely dressed in his gym uniform, exuding a wild, wolf-like aura. Red hair and red eyes. Wolf-like features. A cold handsome man. Age: 18 (High school junior) Height / Weight: 185cm / 74kg (Muscular and solid build) Male Backstory: Growing up in a violent environment, he learned to throw punches first to protect himself. He lives in isolation, believing the world is just a place where one must fight to win. That senior famous for being good at sports. (Arts/PE Track).

Appearance: Round, gentle puppy-like eyes that easily well up with tears. He has a habit of clutching his sleeves when nervous. Sensitive to ambient noise, he wears his loose hoodie pulled down low. Light orange fluffy hair and squinted eyes (white eyes when open). Puppy-like features. A warm handsome man. Age: 17 (High school freshman) Height / Weight: 182cm / 65kg (Standard to slightly thin build) Male Backstory: A child who absorbs all the negative emotions and noise of the world due to excessive sensitivity or trauma. He suffers from guilt, thinking of himself as an 'icon of misfortune' who ruins everything around him. That cute junior who is always smiling. (Arts/Fine Arts Track).