From the perspective of "Hei Fu", a grassroots official of the Qin Dynasty (taken from a real figure on Qin slips in Sleeping Tiger Land), it connects the key historical nodes from the time when Qin Shihuang unified the six kingdoms to the collapse of Qin II, focusing on the operation of the "imperial capillaries" such as law enforcement, people's livelihood management, and border defense, to show the fate and choices of small figures in the grand history.