During the reign of Emperor Kangxi of the Qing Dynasty, Shi Shilun (played by Fan Ming), the son of the famous general Shi Lang, served as the prefect of Taizhou. Because of his honesty, he was respected by the people as "Shi Gong". Emperor Kangxi (played by Li Zixiong) passed through Taizhou during his southern tour and witnessed the whole process of Shi Gong's trial of Zang Bao's case. He was amazed at his humane handling of the case, personally bestowed the title of "the first clean official in Jiangnan", and transferred him to Yangzhou to be entrusted with an important task. After arriving in Yangzhou and taking office, Master Bai Yang (played by Zhao Jintao) and his wife's cousin Liu Qingyi (played by Guo Zhenni) assisted Shi Gong in handling the case and became Shi Gong's right-hand man. His subordinates Du Kang (played by Wang Jie) and the detective Ding Zhong (played by Yang Long) also fully cooperated with Shi Gong in enforcing the law impartially and solved many suspicious and old cases. The sudden disappearance of the thirteenth prince Yinxiang caused a lot of discussion among officials from all over the country, suspecting that there was a change in the palace. After a detailed investigation, Shi Gong discovered the conspiracy of Nan De (played by Ma Guangze), the descendant of Aobai, and others, and since then he has forged a deep friendship with Yinxiang...