In the second year of Hongdao, the Tang Dynasty is engulfed in turmoil as strange phenomena emerge across the land, instilling fear in the populace. Detectives Zhuge Qin and Huang Yi, along with Cui Yaoguang, a female official from the Bureau of Celestial Measurements, are assigned to investigate and quell these disturbances. As they delve deeper into the mysteries, these three ordinary individuals find themselves unwittingly caught in a deadly power struggle within the court—an intricate conflict they never intended to be part of.
