Xu Sheng and Fu Shen met unexpectedly, and later found out that they were in the same class. After that, the two worked together to get into the police academy, and then graduated together. They lived a happy life for a few years and had children. There was a mission that required Fu Shen to be an undercover agent and to defeat a criminal den. But later Fu Shen's identity was exposed, he was brutally tortured by drug dealers, and eventually died tragically. Xu Sheng became mentally ill as a result, and then their son inherited their mantle. In an operation, he was hit in the heart, and in the end Xu Sheng was sent to the black-haired person
Purpose: Anti-narcotics