The film is a prequel to Dongbei jingcha gushi (2021), which tells the story of a righteous Northeast police officer named Li Hongqi who is jealous of evil as enemies. During a blind date, he accidentally discovers the existence of local bullies involved in pornography. As the investigation deepens, a gang of local tyrants who control and oppress women with drugs emerges and openly provokes the police. He never imagined that his best brother was also involved... Faced with innocent victims of women, A group of criminals who are inferior to beasts, Li Hongqi has decided to fight to the end, and is bound to eradicate this "pornography tumor".