Cha Seung-Yeol

Namkoong Dahl is a loser, constantly teased and bullied at school. He is transferred to a new school, where he reunites with an old friend who advises him to pick a fight on his first day so bullies will respect him. When Namkoong sees some bullies picking on a girl he likes, he seizes his opportunity. Unfortunately one of the bullies is the toughest thug in school. The bully challenges Namkoong to a fight after school - a fight Namkoong will do anything to avoid. (imdb)