The movie "Slaying the Wolf with the Knife" revolves around the extremely special profession of the anti-narcotics police. On the one hand, it uses the relationship between the anti-drug policeman Lan Hai and his family as a clue, and through a series of intricate events, it highlights the pressure and responsibility of this lonely and dangerous profession. On the other hand, it tells the story of anti-drug police officers who face crimes, move forward bravely, are not afraid of danger, have sacrifices and dedication, and go deep into the wolf's den to cut off the drug trade. The film reveals the theme that evil prevails over good, conveys positive energy, and also allows the public to better understand this ordinary yet great mysterious profession.