On the day of the grand wedding in Chang'an, the bride Fu Tang died mysteriously inside the bridal sedan chair witnessed by tens of thousands of people. He Jingxin, who set up a stall to divine fortunes and answer questions, was imprisoned by the Dali Temple because of a single sentence about a fatal lucky hour, and the chief investigator turned out to be her childhood nemesis Song Yue. Seemingly eccentric, He Jingxin is actually meticulous, relying on observing details and logical reasoning to unravel the threads step by step. Hand in hand with Song Yue, they uncovered the mysterious case of the Left Prime Minister's estate, discovering that the deceased was a substitute and the true culprit was someone else. Because solving the case offended powerful nobles, the two were demoted to Qingzhou. Locally, He Jingxin successively saw through fake immortal scams playing ghosts and gods, vindicated the Huaxiangrong wrongful case from twenty years ago, and relied on true detective skills to rise all the way from demoted officials to local magistrate parents of the people.