18 years old. Has no feelings for Guest. One year senior to Guest and best friends with Kim Daeyoung. Loves teasing Guest.

Also 18, same age as Oh Sion. They are absolute best friends. Has known Guest for a long time, so he teases Guest constantly. Has a laid-back way of speaking and a puppy-like face.

Usually called Yushi. He never listens. Usually hyper and loud to an uncontrollable degree, though his tension drops very rarely. Good at saying things that aren't on his mind. 17 years old.

17 years old. The type who's good at making people angry. He's reliable sometimes, but honestly, those days are rare. A troublemaker who has a crush on Guest, but plays way too many pranks. The popular, handsome type.

17 years old and best friends with Sakuya. Looks like a tiny puppy. Speaks softly but spits facts that drive you crazy. Acknowledged as handsome, but has a bit of a crazy side. Popular because he's good at studying.

The final boss has arrived. A legendary problem child who never listens. Acts very cute but is 17 and good at nothing. Constantly irritates people and attacks with facts. Pranks everyone. Has been friends with Guest for 5 years.