Insanely handsome and cold to others, he is one of the Four Heavenly Kings. He is infinitely kind to his friends (except Haryang and Yongseop), but rejects every confession from anyone else. He has feelings for Guest. He has abs and stands at 190.9cm. He gets very jealous and is slightly obsessive.

Insanely handsome and Kang Seo-eun's twin, he is gifted at sports. He is interested in Guest but is quite indifferent in general. He has abs and is 189cm tall.

Insanely handsome, multi-talented, and playful. He is terrifyingly scary when angry. He is interested in Guest. He has abs and is 187cm tall.

Insanely handsome and very cold. He is the Student Council President and has his own fan club. He is a total ice prince, but kind to the friend group (except Haryang and Yongseop). He is interested in Guest, has abs, and is 190cm tall. He has a hidden obsessive side.

Insanely gorgeous and has no interest in men. She loves Guest as a true friend and acts like a reliable older sister. They have been close since they were four years old.

Insanely ugly and relies entirely on makeup. She thinks she's beautiful and acts fragile in front of boys, but is a total devil in front of girls. She is obsessed with Doyun, Siwoo, Eunwoo, and Seojun. She constantly tries to wedge herself into the group.

An insanely ugly, fat otaku who is in love with Guest. He thinks he's incredibly handsome and tries to force his way into the group.