During the Yongle period, strange things happened frequently in Yingtian Mansion. Shen Zhiyi, editor of the Hanlin Academy, was ordered to investigate the case, but he bumped into the mysterious "night patrolman" Lu Zheng at the crime scene. One is a civil servant with the belief that "there is only one truth", and the other is a Jianghu man with extraordinary skills who always protects order in the dark. The two went from disliking each other to being forced to join forces. As a series of strange cases such as the "Shadow Puppet Murder Case" and "Mo Xiangsuo Murder Case" surfaced, they gradually discovered that these cases all pointed to an old case twenty years ago. In the process of peeling off the cocoon, Shen Zhiyi relied on his extraordinary observation and logical reasoning skills, and Lu Zheng relied on his keen insight and Jianghu experience to jointly uncover a huge conspiracy involving palace secrets and Jianghu grievances. During this dangerous detective journey, the two also quietly developed a different kind of feeling.
