Wen Ruyan, a doctor of anthropology who specializes in grassroots social governance investigations, once traveled through time and became the daughter of a small official in a poor county in the southwest of Dayan Dynasty. The Cangwu County government office fails to pay taxes every year. The root of the problem is that the county magistrate doesn't even know how many people there are in the county! She rolled up her sleeves and used modern sociological methods to conduct household surveys, draw population distribution maps, establish household records and carry out land surveys, turning Cangwu County upside down. Murong Jin, the supervisory censor who conducted private interviews in private, ran into this "ancient census enumerator" and was so surprised by her accurate maps and solid investigation reports that she borrowed her notes on the spot. From doubting to being impressed by the profession, from cooperating to solve the major salt policy case to being heartbroken, the collision of two smart people in the modern workplace is both sweet and refreshing.