During the Ming Dynasty, there was a female thief Feiying (played by Michelle Yim) who robbed the rich and helped the poor. The detective Lu Zhan (played by Yuen Wah) was also attracted by her charm. After the two got together, they gave birth to a daughter named Lu Shiyi (played by Niki Chow), and Feiying disappeared from the rivers and lakes. When Shiyi grew up, she became a female detective, always upholding justice for the people, but was looked down upon by the men in the government. It happened that the newly appointed county magistrate Shui Dongliu was rectifying the corruption among officials, so he joined forces with Shiyi to solve many strange cases. At this time, a murder case occurred, and the suspect was locked on Feiying. The identity of her mother, which had been concealed for many years, was finally known by Shiyimei. In order to help Feiying clear the name of the crime, Shiyimei decided to find the real murderer with Shui Dongliu.