A drug-related murder case occurred in Baiding City, which linked to murder cases more than ten years ago. Mu Ming, the leader of the special case team who is an undercover agent, meets Xu Leng, the captain of Bai Ting's criminal investigation detachment, who is also an undercover agent. They recognize each other's identities in one murder case after another and put an end to the crime.
Purpose: Uncover a corner of drug crime
