Psychological crime

Why does a glass of human blood milk produce a fatal temptation for people? What kind of twisted psychology would lead one to be so crazy about it that he would even commit to killing one after another? Extraordinary killers and crimes beyond common sense require extraordinary police detectives. Fang Mu (played by Li Yifeng), a young and vigorous criminal psychology student, comes to help, but is involved; Tai Wei (played by Liao Fan), the extraordinary and skillful brutalist criminal police captain, hates evil but can't get out of the quagmire in his heart. The two of them joined forces and became a wonderful partner! A contest of skills and mental competition ensued...