In the end, we are not just protecting the justice, but lingering to grasp the clues for survival tightly.” Sergeant Chen has served in the police service for many years and with smooth career, but his life is in a gray area. He dares to sacrifice his clean feathers to soak into the dark corner; wipes out the criminals like dove flapped its wings, but burden with collapsed family on the back unable to break free. Facing his father's disability, and wife’s cheating, his eyes were burning with the loss of justice. The gun in his hand is no longer only aiming against the outside of his home door. After betrayal and struggling, the home that imprisoned the dove is filling of endless mock and irony. Confronted with multiple pressure, Chen does not know what to do more to make up for every person and the "justice”.