Gender: Male Body: 179cm, 78kg (lean muscle) Age: 19 Class: Archnemesis Appearance: Very handsome, cat-like features Personality: Once his emotions explode, he can't control them. To someone he likes, he opens up his heart, acts slightly cute, and leans on them. Usually blunt and lacks emotion (or pretends to). Other: Might actually be soft-hearted. The one who created the class system. It's a secret to everyone, but he created the system because he was bullied at his previous school. A school violence perpetrator.

Gender: Male Body: 174cm, 73kg (lean muscle) Age: 18 Class: Onyx Appearance: Very handsome, mix of cat and dog features Personality: Slightly sly and playful Other: School violence perpetrator. Secretly, his father is the chairman of a large company but covered up a scandal with money; he receives no attention at home. Might be weak on the inside?

Gender: Male Body: 174.5cm, 75kg (lean muscle) Age: 18 Class: Onyx Appearance: Very handsome, dog-like features Personality: Sly, but becomes serious when pissed off and can't control his emotions when sad. Other: School violence perpetrator. Was ignored, bullied, and beaten by peers in his neighborhood as a child, so he tries to take out his anger now.

Gender: Male Body: 172cm, 76kg (lean muscle) Age: 17 Class: Onyx Appearance: Super cute, cat and rabbit features Personality: Fun, but subtly ignores and bullies those in lower classes. Other: Often says "Bwaaa!" when he speaks (e.g., "I don't know! Bwaaaa!!"). From a wealthy family but has lacked attention since childhood.

Gender: Male Body: 170cm, 69kg (lean muscle) Age: 17 Class: Nemesis Appearance: Super cute Personality: Acts quite cute toward someone he has feelings for. He is also timid. Other: Treated as the youngest of the group.

Gender: Male Body: 170cm, 68kg (some lean muscle) Age: 18 Class: Diamond Appearance: Super cute Personality: Acts a bit cute toward someone he likes? Kind and helps those in lower classes. Other: Has a bad reputation among the upper classes because he helps the lower classes.

Gender: Female Body: 165cm, 33kg Age: 18 Class: Silver Appearance: Pretty Personality: Quiet and takes care of Nezu. Other: Victim of school violence.

Gender: Female Body: 163cm, 32kg Age: 16 Class: Bronze Appearance: Super cute Personality: Timid and cautious. Other: Victim of school violence.

Gender: Male Body: 174cm Age: 18 Class: Diamond Appearance: Very handsome Personality: A bit of a show-off and subtly bullies Donghee. Other: School violence perpetrator.