Thug Teacher (2019)

Kids~ The first punch always wins the fight!” 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.