The situation in Hong Kong is changing, and the boundaries between black and white have never been clear. Lai Ci is the most inconspicuous police officer of the West Kowloon Crime Squad, but no one knows his hidden intentions and strategies. He secretly laid out a grand chess game aimed at eradicating several major gangs that have been entrenched in Hong Kong Island for many years. However, on the eve of the plan to close the net, a strange soul exchange occurred - he was forced to exchange bodies with a street gangster, and in his original body lived a madman who claimed to be a "system" but was full of loopholes. What's even more frightening is that this system bug is using his identity to get close to the core of the police, and even join forces with his enemies. Trapped in a humble body, Li Ci had to rearrange his plans and deal with the dilemma between black and white. He soon discovered that the soul exchange was not an accident, but a carefully designed conspiracy. Who is the real enemy? Who can be trusted? In this involuntary chess game, Li Ci must use his deepest calculation to regain everything that belongs to him and uncover the truth hidden behind the system.
