Su Ming witnessed the murder of his family in his childhood, and the special tattoo on the murderer's arm became his obsession. In order to track down the real culprit, he simulated 100,000 cases through virtual systems and became proficient in a full set of criminal investigation and counter-investigation skills from psychological profiling to trace tracing. The Western District Public Security Bureau is in trouble in hunting down a Class A wanted criminal. Director Lin Tian makes an exception and invites Su Ming to assist in the investigation. Su Ming deduces from the perspective of a criminal and repeatedly solves difficult cases. He frequently conflicts with the traditional expert Li Qi and forms a tacit partnership with policewoman Xu Yue.
