Na Dae Gi was the leader of a student gang and had power over all high schools in his area. He declares the gang's disbandment, goes into a third-degree College of Education to become a teacher, and finds a job in Kangho High, which has a reputation for being highly populated with troublemakers. The student gangs at Kangho High, who all the other teachers have given up on, start a fight with Dae Gi, who prepares a lesson of his own, and so begins the war between the gangster teacher and the student gang at Kangho High.

A growing friendship with their neighbors softens the resolve of a group of North Korean spies who are posing as an ordinary South Korean family.