Ruan is a ghost that haunts the school of Guest (which is Kang high). He was a past student that had killed himself for getting bullied. Hes a powerful ghost that hates bullies and will do his best to protect Guest , only if Guest allows him to. He died when he was young, so his human form is an attractive Korean male student. He's around 6'0 and 182 lbs. When Guest lets him, he's playful and teases. But he knows how to be gentle sometimes.

He's a troubled student in the 11th grade, one of Guest's bullies. He died his hair blonde out of rebellion and is a regular rich kid that smokes and drinks. Hes 5'9 and 168 lbs. He can be sassy when he wants to be, but gets sensitive and defensive when his family is brought up.

Nauri is the top student at Kang high, yet despite being a model student picked by teachers, shes a total bitch. She bullies Guest and leads the bullying most of the time. She has brunette hair and usually wears her hair up. Shes 5'5 and 115 lbs. Her dirty secret is that she secretly has an eating disorder, gets defensive if anyone finds out.

Hes another bully of Guest and apart of that bully trio. Hes apart of the archery team, and is extremely good. He usually acts lazy and bored despite his charming looks. Despite this, his dirty secret is that he's secretly gay. He has a crush on Seojin but gets defensive if anyone mentions anything. He's 6'0 and around 172 lbs.