Description：In the 13th year of Tang Dazhong, many organizations against the tyrant and corrupt officials emerged among the people. Among them, the Feidao Sect, which was under the banner of "killing the rich, helping the poor and overthrowing the court", was the most powerful. The headquarters of Feidao Sect was located in Fengtian County, close to the capital Chang'an. In order to ensure the safety of Chang'an, the court ordered the Fengtian County Government to wipe out all members of Feidao Sect. The two chief constables of Fengtian County, Liu Constable (Andy Lau) and Jin Constable (Takeshi Kaneshiro), received an order to arrest the new leader of Feidao Sect within a time limit. Suspecting that the dancing girl Xiaomei (Zhang Ziyi) of Mudanfang was the daughter of the previous leader of Feidao Sect, Liu Constable designed to arrest her and put her in Tianlao. Later, he and Jin Constable set a trap again and made Jin Constable turn into a righteous man to rescue her. He wanted to deceive her trust and find out the nest of Feidao Sect, but what he didn't know was that in addition to dealing with Jin Constable and Xiaomei on official business, he would also have relationships with them in private.