While under heavily armed guard, the dangerous convicts aboard a cargo ship unite in a coordinated escape attempt that soon escalates into a bloody, all-out riot. But as the fugitives continue their brutal campaign of terror, they soon discover that not even the most vicious among them is safe from the horror they unknowingly unleashed from the darkness below deck.

Sim Deok-soo is a grumpy landlord running a run-down apartment complex. Suddenly his tenants begin disappearing under suspicious circumstances. A retired ex-detective shows up, claiming a serial murderer from 30 years back has returned.

Ji-hyuk is an expert safe-cracker who lives the highlife stealing antiques and jewelry with his team. CHO, a powerful and cruel gang boss threatens them to steal $150 million with him. Ji-hyuk plans to get revenge on CHO, but ends up falling into his trap. However, CHO later realizes it was all part of Ji-hyuk’s scheme. When Ji-hyuk, who was thought dead, reappears, hidden secret relations between the technicians also surface.