Kang Hyuk (Oh Se Hun) is skilled at martial arts. He has dropped out of school and hangs out with his two friends who are also dropouts. One day, Kang Hyuk saves Kyu Soon (Yoo In Hwan) from some school bullies. Kyu Soon ask Kang Hyuk to teach him how to fight, explaining that he wants to protect his younger sister Hyun Sun (Kang Mi Na). Kang Hyuk agrees to teach him and they become friends. When later, Kyu Soon is beaten to death, Kang Hyuk decides to take revenge on those responsible. Jong Il (Jo Byung Kyu) and Tae Jin (Ahn Bo Hyun) are also sick of the violence caused by the school bullies and join Kang Hyuk.