Chen Mu, the constable of Qingyu County, possesses a special ability that allows him to turn back time after death. With his extraordinary talent for solving cases, he tackles all kinds of bizarre mysteries. At home, his beautiful wife, Bai Xianyu, is exceptionally gentle and loving toward him. However, various masters claim that she is a thousand-year-old snake demon, and the couple also have a peculiar agreement not to share a bed for three years. Following the Mu Xiang'er case, a murder at Hanwu Terrace, a series of murders at Juchun Tower, and an old court case involving the substitution of an imperial heir all come to light one after another. Demon-suppression cultivators, experts from the Yin-Yang Sect, and the imperial court's Underworld Guards all make their appearances. Chen Mu continues to solve bizarre crimes while caught between supernatural forces in the martial world and the treacherous power struggles of the royal court.