Guard pass

Lim Sejun, a food-loving security guard with a bulky frame, carries himself with unshakable confidence, unfazed by jokes about his weight. His only close friend, Seo Hajin, has trained in jiujitsu since childhood to shield him from harm. When a class bully targets Sejun, Hajin steps in and humiliates the troublemaker. But soon after, Hajin is brutally assaulted, left with a shattered knee and deep emotional scars. Frustrated by the stalled police investigation, Sejun hunts down the attacker himself—only to be overpowered by the delinquent’s jiujitsu skills. Rescued by a man named Jason, Sejun begins training under him. Three months later, now leaner and skilled in combat, he uncovers a shadowy group’s involvement and vows to dismantle them. A gripping tale of personal vengeance unfolds.