Policeman Li Huiming (played by Danny Lee) is a cynical guy with a very casual style of behavior. He would even take advantage of the girl who was doing morning exercises by colliding with her on the pretext of something. However, he was still conscientious in catching criminals. The staff of the police force called him the big lover, especially the old policeman Ya Biao (played by Wang Zhong) who cooperated with him tacitly. However, the new female boss was very uncomfortable with them. Once, he fought in a restaurant for the female model Annie (played by Yang Xueyi) whom he had never met. Later, in the process of catching the criminal big smoker, he met Annie, who he rescued last time, again and learned that she was being harassed. It turned out that she was secretly photographed by her photographer boyfriend Ricky when she was changing clothes, and the latter threatened her to submit. In order to help Annie vent her anger and start a relationship at the same time, the big lover stepped forward and taught her boyfriend a lesson in public, which was hated by the other party. Later, in a case, he sent his boyfriend who made trouble for an excuse to a mental hospital. Unexpectedly, the latter secretly escaped from the mental hospital and began a brutal revenge...