Hyeon-ki, nicknamed 'Oddball' by his classmates, is a highschool taekwondo expert. When a beautiful, but arrogant, rich girl requests his help, he at first refuses until he, in turn, needs help to save his sick friend.

Someone has been breaking into the school at night and stealing from the classrooms, so it's up to the class clowns and the school trouble-maker to catch the culprit