The soul of modern engineer Yang Sen traveled through the body of a poor Jinshi of the same name in the Dayin Dynasty. Because he offended the powerful, he was sent to Beihuang County, the most barren and dangerous county in the empire, as the county guard. Faced with the desperate situation of famine, banditry, oppression and barbarian threats, he activated the "civilized infrastructure system". Yang Sen used the system to exchange potato and sweet potato planting technology, and used work instead of relief to build water conservancy projects. This initially stabilized people's hearts and obtained the first bucket of civilization points. At the same time, he faced the provocation of the powerful local Zhao family. Through his ingenuity and the system's exchange of simple cement formulas, he formed a militia to repel the bandits colluded by the Zhao family. He gained a foothold in Beihuang County, but he also formally forged a deadly feud with the Zhao family and the group of prime ministers behind them.
