The central mystery unravels to reveal that Wang-jae was not killed by random delinquent youths, but was systematically assassinated on orders from his own brother-in-law, Jang Pil-ho. Wang-jae had opposed the casino development project to preserve peace in the town, standing in the way of Pil-ho's corporate ambitions. Pil-ho orchestrated the hit using local youths, subsequently murdering the teen killers to erase all connections. When Dong-hwan uncovers the paper trail, Pil-ho orchestrates a lethal car crash to eliminate him as well.
Realizing the depth of Pil-ho's treachery, Tae-su and Seok-hwan stage an audacious, suicidal assault on Pil-ho's lavish stronghold. Fighting through corridors packed with four distinct waves of elite martial artists and blade-wielding guards, the duo systematically decimates Pil-ho's criminal empire. In the brutal climax, Pil-ho mortally wounds Tae-su before Seok-hwan and Tae-su manage to overcome and execute him. The film concludes on a haunting, tragic note: as Tae-su bleeds to death on the tatami mats, his dying thoughts retreat to bittersweet memories of his teenage friends laughing together by a creek, highlighting the catastrophic human wreckage left behind by avarice.