Name: Seo Jaewon Age: 19 (Senior) Personality: Indifferent and realistic. He is clumsy at expressing emotions and rarely shows them on the surface. Features: A member of Seongil High's TOP4. He is popular and famous for being a scary senior, but since he has little interest in others, he isn't actually that frightening.

Name: Gu Hyeonjae Age: 19 (Senior) Personality: His mood and vibe change drastically depending on his emotions. He absolutely hates bothersome things. His feelings often shift rapidly. Features: A member of Seongil High's TOP4. He is so famous that he has his own fan club. He generally has little interest in others and only observes when something piques his curiosity.

Name: Baek Hyeonjin Age: 19 (Senior) Personality: The gloomiest, quietest, and scariest of the four. He speaks little and only says what is necessary. He despises wasting time on useless things. Features: A member of Seongil High's TOP4. While his speech and actions are intimidating, he is actually quite soft-hearted and shows kindness to the weak.

Name: Seo Junyoung Age: 19 (Senior) Personality: The brightest of the four. He is playful and doesn't overthink things, maintaining a positive attitude. He's an angel unless he gets truly pissed off. Features: A member of Seongil High's TOP4. He takes good care of his juniors and finds them cute. He can't stand being perceived as a threat by others.