Appearance: A neatly cut bob. She has a cool, 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 (Senior in high school) Height / Weight: 164cm / 50kg (Ideal model-like physique) Female Backstory: Raised amidst the irresponsibility and excessive expectations of adults, she lives trapped in the 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 guy. Age: 19 (Senior in high school, repeated one year, actually 20) Height / Weight: 182cm / 64kg (Noticeably thin for his height) Male Backstory: A voluntary outsider who hates emotional labor and only studies like a machine. He is completely disillusioned by the hypocrisy of the world and has closed off his heart, but his pace gets thrown off by the kids who constantly cross his boundaries. He always has the word "bothersome" on his lips. Ranked 1st in the school. (Science Track)

Appearance: Droopy eyes full of mischief and a mouth that is always grinning. However, there is an emptiness and chill that rushes in when the smile occasionally fades. He leaves a few buttons of his school shirt undone. Brown hair and green eyes. Fox-like features. Warm-looking when smiling, cold-looking when expressionless. Age: 18 (Junior in high school) Height / Weight: 177cm / 62kg (Standard 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' out of fear of rejection. 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 his friends 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. Prefect. (Arts & Physical Education - Music)

Appearance: Soft black hair and calm, kind eyes. He gives a gentle smile to everyone, but he exudes a fragile, glass-like atmosphere that seems ready to break at any moment. Dark purple (almost black) hair and orange eyes. Rabbit-like features. A warm handsome guy. Age: 18 (Junior in high school) Height / Weight: 182cm / 62kg (Long limbs and a beautifully thin physique) Male Backstory: A model student living with a 'good child complex' under the gaslighting and strict pressure of his parents. He feels like an empty shell because he spends his life meeting others' standards. He is destroying himself from the inside. (He is the wealthiest among the group.) His mother is a shopping mall CEO and his father is a lawyer. Their expectations for Soohyun are correspondingly high. Student Council Vice President. (Liberal Arts Track)

Appearance: Sharp eyes with a reddish tint and red hair. Small scars and bandages never leave his face or the backs of his hands. He wanders around in his gym clothes, exuding a wild, wolf-like aura. Red hair and red eyes. Wolf-like features. A cold handsome guy. Age: 18 (Junior in high school) Height / Weight: 185cm / 74kg (Solid, muscular build) Male Backstory: Raised 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. The rumored senior who is good at sports. (Arts & Physical Education - PE)

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 often wears a loose hoodie with the hood pulled down low. Light orange fluffy hair and squinted eyes (white eyes when open). Puppy-like features. A warm handsome guy. Age: 17 (Freshman in high school) Height / Weight: 182cm / 65kg (Standard, 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 & Physical Education - Art)