Police officer Zhang Yiang (played by Wang Xiao), who has been away from front-line criminal investigation for several years, was sent to Sanjiangkou to investigate the case because of an anonymous report letter received by the provincial department.Not long after Zhang Yiang arrived at Sanjiangkou, he encountered the murder of the criminal police captain. While clearing his suspicion, Zhang Yiang accidentally arrested the murderer of the serial murder case and quickly established his reputation.

Zhang Yiang locked the investigation direction on the gang of local wealthy businessman Zhou Rong (played by Wang Chuanjun), but there were endless thieves, and the butterfly effect of the intrigues between the thieves helped the police led by Zhang Yiang to achieve great successes.“Fate” brought Zhang Yiang and all the stupid thieves together to have the last laugh with their wisdom and courage, and also find out the cause of the murder of his colleagues, and finally let the real culprit be brought to justice.