After dropping out of high school, Daegun Kwon spends his days working part-time at a convenience store while studying for his GED exam. His quiet life takes a sudden turn when a group of troublemakers harasses him at work. However, Daegun quickly proves that he is far from an easy target, effortlessly teaching the punks a painful lesson.

Soon after the incident, a mysterious woman from the Education Foundation approaches him with an unusual proposal—participate in a secret project called “Designated Bully.” The program aims to restore order in schools where violence and bullying have spiraled out of control.

In exchange for a second chance at a normal student life, Daegun accepts the offer and returns to school. But his role is unlike any other student’s. His mission is simple yet dangerous: become the school's “designated bully” and take down the real bullies who rule through fear.

Armed with his strength, determination, and a strong sense of justice, Daegun begins his fight against the violent hierarchy within the school. But facing multiple powerful delinquents won’t be easy, and every battle pushes him closer to the truth behind the brutal system.

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