Linghai City narcotics police officer Zhuang Xin was injured while capturing a drug dealer, and was arranged to cooperate with converged media to do a law popularization live stream. During the live stream, she unexpectedly involved the family members of drug users and victims. Zhuang Xin followed the clues, starting with Xiao Zhong as a breakthrough, and dug out a drug-trafficking organization of unemployed woman Xiao Li and college dropout A Hua in the sales network. After investigation, Zhuang Xin found Bai Tou, A Hua's superior, and brought out Bai Tou through broadcasting Xiao Juan's life. Under Zhuang Xin's psychological education, Bai Tou turned over a new leaf, exposed the drug-manufacturing den, and destroyed the entire drug-manufacturing syndicate at the cost of his life. At a critical moment, Zhuang Xin protected Bai Tou's daughter and brought the crafty drug lord to justice.