School violence is not just an argument that arises among classmates, but an act of violence that includes attack, confinement, threat, rape, etc which give victims mental anguish and personal injuries. As time passes, such terrible deeds are becoming more serious. The example of this act is ‘Daegu middle school student incident’ that made the victim commit suicide owing to the attackers’ blackmail. To make matters worse, these happenings occur commonly.