The evil Black Dragon Jie Hook feeds on emotions such as bitterness, fear and sorrow. He creates a plague on earth and sends the demon dragon Fish Bu Confusion (Roy Cheng) and the tree demon Pu Kwai (Zhang Chuxuan) to capture his nemesis Li Xin Yuan (Chen Haomin) in his dreams. In the course of the assassination, Pu Kui is impressed by Li Xin Yuan's kindness and integrity in saving the people and gradually swayed. The assassination mission is delayed again and again, and the suffering on earth makes the evil dragon accumulate enough strength to come to earth to kill his destined enemy Li Xin Yuan himself.

Twenty years after Professor Yu’s tragic death while trying to stop the new drug MG32, traces of the drug resurface in an overseas murder case, indicating the return of drug lord Sha Kun. Now, Yu’s son, undercover officer Yu Fei, teams up with law enforcement in a high-stakes operation to take down the powerful international drug syndicate.