A tough young man with a short temper and no patience for bullies gains a legendary reputation as the best street fighter in Busan.

Jang Byeong-tae is a small and weak boy living in Onyang in South Chungcheong Province. He's at the bottom of the school's social ladder and when he transfers to the neighboring Buyeo Agricultural High School, he faces an unexpected incident that becomes a turning point in his life.