After dropping out of high school, Daegun Kwon works part-time at a convenience store while preparing for his GED. Following an incident where he is harassed by a group of punks during his shift and teaches them a lesson, Daegun is approached by a woman from the Education Foundation regarding a project titled "Designated Bully." Presented with another opportunity for a normal life, Daegun accepts the proposal and returns to school to fulfill his sole responsibility as the designated bully: to dismantle the other bullies and restore order to the school.