Chu Chen, who was once a legend in the police world and a top criminal profiler, was tracking down a serial killer codenamed "Ghost" three years ago. Due to the vicious trap set by the other party, his best friend was sacrificed. He was ruined and was forced to "evaporate from the world". He took the pseudonym "Chen Zhuo" and became a community worker living in an old community in Longcheng.
