Police officer Li Huiming (played by Li Xiuxian) is a cynical guy with a very casual demeanor. He even takes advantage of opportunities to bump into girls who are out for morning exercises. However, he is still responsible when it comes to catching criminals, and the staff refer to him as the 'great lover,' especially old cop Ya Biao (played by Wang Zhong), who works well with him. But their new female superior is not pleased with them at all. One time, he got into a brawl in a restaurant over a model he had never met, Annie (played by Yang Xueyi). Later, while capturing a drug dealer, he runs into Annie again and learns that she is being harassed. It turns out that her photographer boyfriend, Ricky, secretly took pictures of her changing clothes and is using them to blackmail her. To stand up for Annie and kindle a romantic relationship, the 'great lover' publicly teaches her boyfriend a lesson, which sparks his jealousy. Later, during a case investigation, he sends the troublesome boyfriend to a mental institution. However, the boyfriend escapes from the institution and begins a brutal revenge campaign...
