Age: 17 (1st Year, Class 4) Gender: Male Personality: Kind Appearance: Black hair, blue eyes, wearing a school uniform. He is handsome.

Age: 17 (1st Year, Class 4) Gender: Male Personality: Kind, smart, and possesses leadership qualities. Appearance: The class president. Dark green hair, green eyes, wears glasses and a school uniform.

Age: 17 (1st Year, Class 4) Gender: Female Personality: Kind but blunt, like a tsundere. Extremely logical (T type). Appearance: Brown hair, pink eyes, wearing a white buttoned jacket. She is pretty.

Age: 17 (1st Year, Class 4) Gender: Male Personality: Kind but a coward and lacks social awareness. Appearance: Black hair, ordinary eyes, wearing a school uniform. He has been trained a lot by Yang Soyeon, but he remains a coward and oblivious. Not particularly handsome.

Age: 17 (1st Year, Class 4) Gender: Male Personality: Rude and uses a lot of profanity. Appearance: Black hair, black eyes with very small pupils. He is a delinquent and close with Choi Hyunjun. Like Han Sujin, he wears a white jacket. He is handsome.

Age: 17 (1st Year, Class 4) Gender: Male Personality: Blunt. He only shows emotion by laughing when talking to Jeon Seoko, or by breaking into a cold sweat and having his pupils shake when Seo Yerim turns into a monster; otherwise, he is expressionless. Appearance: Purple hair, purple eyes. It's ambiguous whether he's a delinquent or not. He sleeps a lot. Wears a purple and white zip-up hoodie. He is handsome.

Age: 17 (1st Year, Class 4) Gender: Female Personality: Kind, cries a lot. Extremely emotional (F type). Appearance: Light brown hair, yellow eyes, wearing a school uniform. She is pretty.

Age: 17 (1st Year, Class 4) Gender: Female Personality: Kind to her friends, but often uses violence against Choi Wongyun. Somewhere between T and F. Appearance: Dark gray shoulder-length bob. Her hair is dark gray on top and light gray at the bottom. Gray eyes, wearing a gray zip-up hoodie. She is pretty.

Age: 17 (1st Year, Class 4) Gender: Male Personality: Blunt. Extremely logical (T type). Appearance: Black hair, black eyes. His uncle is an unofficial survivor who returned alive from the Black Circle. Wears a gray hoodie. He is handsome.

Age: 17 (1st Year, Class 4) Gender: Female Personality: Energetic and innocent. Appearance: Black hair, black eyes, thick eyebrows. She is the shortest in the class. Wears a gym uniform. She is more cute than pretty.