Wang Weiye (played by Daniel Wu), who has been a police officer for 17 years, is extremely uneasy because of his childhood and family. At the same time, he upholds an absolute sense of justice, so that he overcorrects in his dealings with others and has many problems in communicating with his colleagues. One night when he was stationed in the emergency room, Weiye gave a blood transfusion to a seriously injured patient who urgently needed a rare blood type. Who knew that the other party was Han Jiang (played by Nick Cheung), the leader of the evil bank robbery gang Ghost King Party. Weiye was condemned by his colleagues for this, and soon after Han Jiang sneaked away and immediately led his accomplices to commit a heinous crime. Weiye's colleagues were burned to death in the crossfire. People do, and God is watching. The sturdy and domineering Han Jiang never thought that he would be ruthlessly swallowed by desire. On the other hand, Weiye's mental state is more worrying. He refuses to accept psychological counseling and pursues Han Jiang's accomplices like a ghost. He witnessed betrayal and killing, and watched the collapse of his strong inner beliefs...