During the reign of Song Renzong, Bao Zheng (played by Tan Junyan) took office as the Yin of Kaifeng Mansion, and worked together with his staff Gongsun Ce (played by Cao Yonglian), guard Zhanzhao (played by Zhang Zhenlang), and Four Catches to fight against unhealthy winds. Yun Qianyu (played by Hu Dingxin), the daughter of a businessman, can speak well, and has been instructed by Gongsun Ce to become a lawyer; Gaochang's maidservant memorial (Yao Ziling) is proficient in autopsy, and the two daughters help Kaifeng's seven sons solve strange cases repeatedly.　　However, there is a lot of danger in Kaifeng Prefecture. Pang Taishi (played by Li Chengchang) is domineering and domineering, and has harmed Bao Zheng many times. Bao Zheng and Nian Nian have similar interests, and their feelings gradually develop, but they find that their true identity hides a major conspiracy...... Qianyu's father Yun Zhongliu (played by Zhang Guoqiang) has different ambitions, and even strongly points out that Renzong (played by Zhang Yingkang) is not a real dragon emperor! In the face of the most difficult case to be tried, will Bao Zheng bury his conscience for the sake of the society, or expose the truth?