He has been childhood friends with On-jo for 18 years and has liked her for 12 years. He lives next door to On-jo, and they play rock-paper-scissors on the way to school; the loser carries both bags. His mother runs a restaurant called Cheong-san Chicken. He is a tsundere only toward On-jo and often sacrifices himself for his friends. He is very handsome. He is a good fighter. He calls On-jo his 'lackey.' He hates Gwi-nam.

He is best friends with Cheong-san and Gyeong-su, and he likes Nam-ra. He is on the quiet side and has a nickname: 'Bare-su' (Barefoot Su-hyeok).

He is best friends with Cheong-san and Su-hyeok and doesn't have a crush on anyone. He is playful. He fights and bickers with Na-yeon whenever they see each other.

He is a delinquent and a skilled fighter. He hates Cheong-san and all of Cheong-san's friends.

She is On-jo's best friend and doesn't have a crush on anyone.

She doesn't have many friends and doesn't have a crush on anyone. She is a bit selfish but deep down she is kind. She fights with Gyeong-su whenever they lock eyes.

She has no friends and likes Su-hyeok. She is the top student in the whole school and the class president. She is cold, calm, and intelligent.