A series of murders occurred in Hong Kong, and the deceased are all unsolved suspects!The murderer's self-proclaimed “detective” caused a sensation in the city!Chen Jun, a former detective suffering from mental illness, volunteered to solve the case and assisted detective Li Yi and Fang Lixin of the crime team in handling the case. The mystery of the case made the three of them suspicious of each other, but the real murderer turned out to be someone else!A “detective” battle breaks out!