Four friends bound by destiny and unbeatable in the dark world. When a casino attack goes wrong as a result of betrayal, fate turns them into enemies. Now, forced to aim the gun at each other's hearts, their unavoidable battle begins.
Officers Kyung-yoon CHO and Eun-joo PARK are on the hunt a killer following duo of ghastly murders. The victims carry a common military past, and the secret of their past must be unraveled to find the killer.