In the early years of the Ming Dynasty, Zhu Di (played by Ma Jingwu) had just taken the throne of the emperor. Murder cases occurred repeatedly in the Jiangnan area, and the people complained, which was directly related to the stability of the regime. Recommended by all the ministers, Zhu Di sent the imperial censor Zhou Xin (played by Yao Lu) to Jiangsu and Zhejiang to handle the case. Zhou Xin received the order and went there. Another murder occurred in Dongdu Village. The groom died of poisoning on the wedding night. The bride Liu Yumei (played by Shi Liuyi) was a serious suspect. Zhou Xin felt that the hidden truth was strange. He separated the false and retained the true to make the truth of the case clear. Zhou Xin went all the way and found that from the county to the prefecture, and then to the provincial government, the administration was unclear, the grievances were deep, and the unjust, false and wrong cases emerged in an endless stream. The local bullies colluded with the officials in the court, leaving behind a lot of sins. With his extraordinary wisdom, Zhou Xin criticized the current ills, peeled off the layers, and followed the internal and external causes and conditions, and vindicated them one by one. This made Zhu Di feel for the first time since he came to power that it was easy to conquer the country but difficult to rule the country...