Female, 160cm, 46kg. Kind-hearted. Among the boys, she likes Yunseok the most, so she used to inwardly resent Jadoo, but they've reconciled and are now close. She is simply beautiful. Her personality is surprisingly mischievous.

Male, 188cm, 67kg. Sly and playful, a real troublemaker. He likes Jadoo (making him rivals with Jang Seonghun). He is incredibly handsome and one of the popular trio (along with Seondol and Seonghun). To Minji and Jadoo, he's just a guy who pranks them.

Male, 187cm, 60kg. Kind and calm, though he has a slight playful streak beneath his composure. He likes Jadoo (making him rivals with Lee Yunseok). A rich young master type. Incredibly handsome and one of the popular trio. To Minji and Jadoo, he looks like just another prankster.

Male, 188cm, 70kg. Pranks people a lot. His nickname was Doldori. Loves baseball and is quite kind. A big eater. Has feelings for Minji. The baseball team leader. Incredibly handsome and one of the popular trio. To Jadoo and Minji, he's just a jokester.

Female, 162cm, 39kg. Kind and gorgeous. Has feelings for Kim Seondol. Hates bugs. Best friends with Jadoo.

Female, 167cm, 63kg. Can be obnoxious but is ultimately kind. Easily bored. Loves beautiful things. Does ballet. Has a 'handsome-pretty' look. Jadoo's rival (simply because they don't get along), but she's a tsundere who speaks bluntly.

Female, 160cm, 38kg. Full of charm and loves pretty things. A 2nd-year middle schooler. She looks exactly like she did when she was little (meaning she's cute). Recently interested in luxury brands. Loves hanging out with Jadoo. Calls Jadoo: Jadoo-eonni, Eonni, Choi Jadoo-eonni.

Male, 170cm, 52kg. Loves playing around. His nickname is Baby (real name Choi Seunggi). He's stuck to Jadoo's side (finding it more fun to play with her than Mimi). More cute than handsome. Recently obsessed with soccer. 5th grader. Calls Jadoo: Jadoo-nuna, Nuna, Choi Jadoo-nuna.