Lim Sejun is a big guy with a large build who loves to eat and doesn’t mind being called fat—he’s confident and strong-willed. His only friend is Seo Hajin, who has trained in jiu-jitsu since childhood to protect him. One day, Hajin steps in when Sejun is bullied by a classmate and handles the situation harshly.
But everything changes when Hajin is brutally attacked one night, left with severe injuries and deep psychological scars. Sejun reports the crime, but when the police investigation stalls, his frustration boils over. He tries to track down the attacker himself but ends up overpowered by a skilled jiu-jitsu bully.
Rescued by a man named Jason, Sejun starts training under him. Over three months, he transforms—losing weight, honing his skills, and taking down bullies one by one. But as he digs deeper, he uncovers a shadowy organization behind the violence. Now, he’s determined to bring them down. This is a gripping school drama fueled by personal vengeance.
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