Daegun Kwon, who left high school, is presently employed part-time in a convenience shop while preparing for his GED exam. One day, while working, he had a clash with a gang of troublemakers, and after teaching them a lesson, he was approached by a woman from the Education Foundation, offering him an opportunity to live a normal life again. The initiative, dubbed "Designated Bully," entails Daegun being tasked with dismantling other bullies and restoring order to the school. Without hesitation, Daegun accepts the offer and enrolls in school to fulfill his duty as the designated bully.