"I will destroy my organization with my own hands."

Lee Gangjin was the ultimate skilled gangster in the dark world. But he is betrayed and killed by his most cherished younger brother, Jo Dooyoung.

At that moment of death, he awakens in the body of high school student Lee Kangjin, who had ended his life due to being overwhelmed by school violence.

Meanwhile, to maintain the faction, the Gangjin Faction starts an Underworld Audition, and delinquent teenagers are enthusiastic about joining the Gangjin Faction.

Filled with remorse, Gangjin resolves to undo everything and personally eliminate the Gangjin Faction he established.