Cheng Jie, a drug enforcement officer who had just joined the team, was bitten and suspected of being infected with AIDS while arresting a drug dealer. Captain Liu Yunfei was notified that there would be a big drug deal in Jiangcheng. While arresting drug dealers and breaking the mystery of Cheng Jie's AIDS infection, the suspect Yu Changpu came into the police's sight. After investigation, Yu Changpu was just being used, and the drug lord behind the scenes was the mine owner Yang Jiang.