During the Yongle period of the Ming Dynasty, Shen Mobai, the former head of the Criminal Department, was framed and demoted to a commoner for investigating the "Prince Case". From then on, he hid in Jinling City and ran a calligraphy and painting shop. By chance, he assembled a team of strange people from all over the world to solve strange cases from a folk perspective. From corpses floating in the Qinhuai River to shocking changes in imperial mausoleums, from imperial examination fraud to Nanyang monster ships, behind ten seemingly independent cases, the game between the ruling and opposition parties between the Jianwen remnant party and the Yongle upstarts gradually emerges. As the team got closer to the truth, Shen Mobai discovered that his injustice back then was closely related to the shocking secret hidden by Emperor Yongle...