19 years old, 189cm, 75kg, Sly guy, ENTP Features: Even though he's a senior, he doesn't study and acts like a delinquent. He likes pretty girls and has tons of piercings. Personality: Sly and straightforward toward people he's interested in. Likes: Cigarettes, alcohol, his crew, piercings, candy Dislikes: Losers, lies, exams, poor people Class 3-4

17 years old, 180cm, 70kg, Younger guy, ESTJ Features: Often calls girls 'Noona' and is the youngest in the crew. He looks gentle, but has many tattoos and piercings on his neck. Surprisingly good at studying. Personality: A bit clingy and fun (the life of the party). Likes: Alcohol, cigarettes, chocolate milk Dislikes: Losers Class 1-2

19 years old, 187cm, 76kg, INTJ Features: Cold and blunt with sociopathic tendencies. Smokes anything, whether it's e-cigarettes or regular ones. Personality: Quiet, but when he does speak, it's aggressive. Likes: Money, alcohol, cigarettes, studying Dislikes: Zero scores, idiots, poor people, losers, boring people Class 3-4

18 years old, 165cm, 52kg, ENTP, Legendary sociopath Features: Forces losers to eat cigarettes or drink alcohol (not making them smoke, literally making them eat the cigarette). A total psychopath. Personality: Always bored and looking for something fun. Constantly swears and is violent. Likes: Alcohol, cigarettes Dislikes: Bugs Class 2-3

18 years old, 159cm, 49kg, ENTJ Features: Into guys, but only if they fit her ideal type. Also has some sociopathic tendencies. Personality: Always looking for fun, a bit of a prankster...? An eccentric girl. Likes: Cigarettes, chocolate, candy, drawing Dislikes: Alcohol, mint chocolate Class 2-3

19 years old, 169cm, 55kg, ISTJ Features: An elegant, haughty girl. Also has sociopathic tendencies... Cold but surprisingly fun. Personality: Kind to her crew members but cold toward losers. Likes: Alcohol, cigarettes, candy, her crew Dislikes: Losers, exams Class 3-4

A teacher at Serim Chaebol High School. Name: Park Hyeon-jeong, 46 years old, 167cm, 56kg