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.

Thug Teacher

Soon-jeong, 18-year-old, living with her mother, is full of dissatisfaction with her home and school in particular with her mother. She dreams of immigrating to Australia as soon as she graduates from high school. So she has been working part-time at a convenience store early on, but the reason Soon-jeong’s plans are disrupted is none other than because of the new homeroom teacher, Hee-joo. Soon-jeong wants to get out of the self-study class at night for working her part-time job, but Hee-joo turns it down. Tension continues to rise between the two.