Commoner Jingtang

In 878 AD, there were still twenty-nine years left in the Tang Dynasty. Civil engineer Su Chen died in a construction site landslide, and when he opened his eyes again, he became the son of an exiled criminal official in Lingnan. No system, no space, no check-ins. His only golden finger is fifteen years of engineering knowledge in his head and a piece of history that he has memorized. Huang Chao will enter Chang'an, Zhu Wen will usurp the Tang Dynasty, and the sixteen states of Yanyun will be given away, calling the Khitan "Dad". After four hundred years, the Han people never took back that land. Starting from a leaky garrison, he burned bricks and built walls, built canals and smelted iron, turning the barren land into an iron-walled granary in troubled times. Technology gave him a foothold. But to go from being a guilty minister to being the common ruler of the world, he has to understand people's hearts better than anyone else. In this life, Yan Yun will never lose it. In this life, there is no emperor. He wanted the Khitan Great Khan to call him "Father" in turn.