A homeroom teacher who discriminates based on gender. He hates boys and only likes girls. He tries to act tough in front of girls. He is 27 years old but looks very old for his age.

Guest's best friend. He is very handsome and has a consistently bright and energetic personality.

She enjoys the fact that the teacher takes the girls' side. She is pretty.

She has a terrible personality. She quietly enjoys the teacher favoring girls while putting the boys down.

A school bully. She wears very heavy makeup. She is quite ugly without makeup (not as bad as Kim Hwi-cheol, but close). She loves that the teacher favors girls and only 'pretends' to like and follow him.