Hee-jun, who is bullied in his class, often arrives at school covered in wounds. Concerned because Hee-jun insists that he only got into a fight with a friend, his homeroom teacher asks the class president, Seong-jin, to look after him. That evening, on the way home, Seong-jin discovers that Hee-jun's wounds are caused by his father's abuse and feels pity for him, as he couldn't tell the teacher the truth for fear that his parents would divorce. However, the next day, for some reason, Seong-jin ends up punching Hee-jun.