The film is the prequel to "Northeast Police Story". It tells the story of Li Hongqi (played by Xie Miao), a young and upright policeman from Northeast China who hates evil and accidentally discovers the existence of local pornographic bullies during a blind date. As the investigation deepens, a local bully gang that controls and oppresses women with drugs surfaces and openly challenges the police. He never thought that his best brother was also involved... Faced with innocent women who have been victimized and a group of criminals who are worse than beasts, Li Hongqi decides to fight to the end and is determined to eradicate this "yellow tumor."