At a prison in the United States, suddenly, a power outage broke out in the prison, and murder occurred while a jailer was away. Ten minutes after power was resupplied by emergency power, the guards who returned to Sa-dong were inspecting the prison room. Two people lying side by side in a solitary room of the gang, one of them was bleeding from the head of a blunt weapon as the owner of the solitary room and fell distracted, and the other was the victim Lee Chang Woo, who was found strangled next to the gangster. The victim was deliberately committed to supporting the boss when the boss was imprisoned as the number 2 of the New World group and was sentenced to 8 years in prison and imprisoned in the same prison. Also, because of his strong tendency to be violent, he usually complained a lot from other inmates. (Source: namu.wiki)