In a certain island nation in the Pacific, the local branch police officer is called “Blue Coat” because he always wears a blue suit. One night, Blue Coat gets a call for support from his old partner, Shao-xuan. As Blue Coat arrives, some men in black suddenly take out their guns and fire. The police officers fall to the ground one after another, and the men in black evacuate the scene. The more leads he tracks, the foggier the case becomes. A top-secret strategic deterrence self-protection plan involving nuclear weapons leaks, and the innocent Blue Coat becomes involved with high-level national security and CIA agents. Blue Coat, who vowed to track down the killers, starts wondering whether he should quit or not…