Im Da-Joon, a high school student accustomed to bullying, reaches a breaking point where he contemplates suicide. However, a chance encounter with a TV interview of a friend's killer sparks a new purpose within him - seeking revenge. After achieving his vengeful goal, Da-Joon's life takes an unexpected turn as he abandons school to join a group of runaway teenagers. While liberated from school tormentors, he now faces a different challenge - navigating the treacherous territories of street gangs far more formidable than mere schoolyard bullies.