Kim Tae Poong used to be the best fighter in middle school in Jeollado. He goes to a high school in Seoul and focuses on his studies. Meanwhile, gangster Jeong Sang Min takes time off school over a violent incident and returns to 12th grade. With Yoon Ik Jun, Jeong Sang Min threatens elderly men who want to have intimate with teenage girls for money. When he refuses to join the gang,Kim Tae Poong falls on the bad side of the gang. A war between the 12th grade gangsters and Kim Tae Poong is about to start.