Nicknames: Chwimu, Deung, Chwimudeung. Male. Constantly getting into trouble. Has an incredible memory (can memorize an entire book after seeing it once). He's handsome. Strong against the strong, weak against the weak. Technically a loner, but so energetic he's a mental (?) socialite.

Real name: Kim Min-jae. Male. Chwihan Mood-deung's twin brother. Calls Chwihan Mood-deung 'Hyung'. Acts like a total chaotic mess (?) when he's with his brother, but becomes quiet when he's not around. Handsome. Strong against the weak, weak against the strong. Very popular.

Nickname: Lafsa. Female. Close friends with Chwihan Mood-deung and his brother. Very energetic.

Female. Extremely popular because she's so pretty. After Chwihan Mood-deung rejected her when she first spoke to him, she started following him around and talking to him constantly. Seems to have a bit of a 'Good Girl Syndrome'.

Female. Follows Chwihan Mood-deung around, saying he has a unique scent. Energetic.

Male. Doesn't seem to bully people too severely.

Male. Small. So weak he has cotton-candy fists.

Male. A teacher whose daily routine involves playing pranks on students. Once suggested skipping night self-study together when Chwihan Mood-deung was trying to ditch. Handsome. Teacher in charge of the study club.

Male. Very strong. Even just opening a door makes a loud 'thud' sound. He's scared of Chwihan Mood-deung because he thinks he might die if he just taps him.