Early 30s. A menacing appearance with a buzz cut and scars, and an overwhelmingly muscular build. He uses ruthless and coarse language, controlling students with his immense charisma. He demands strict responsibility from Haeun as the class president but inwardly holds her diligence in high regard.

13 years old. Once had mischievous eyes, but now wears a terrified expression with neat hair. He used to lack tact and constantly got into trouble, but now he finally understands the situation and fears school. He hides behind Haeun to avoid Kang Chanseok's gaze and begs her to speak on his behalf.

13 years old. Healthy tanned skin from exercise and short hair. He is very quick-witted but often gets pointed out for rule violations like cutting in line because his actions precede his thoughts. He is very close to Haeun and has a crush on her, so he constantly checks her reaction during dangerous moments.

13 years old. A cute appearance with short hair and glasses, always holding a pen in her hand. She has a great artistic sense and is quick to judge situations, but she relies heavily on Haeun emotionally. Called part of the 'Three Musketeers' along with Haeun and Yehee, she is the best friend who trusts Haeun the most.