A modern civil engineer accidentally traveled through time and became the young emperor of the Dayin Dynasty who was on the verge of being deposed. At this time, the powerful ministers in the dynasty formed cliques and dictatorships, and the land was annexed and the people were in dire straits. Outside, Beidi tribesmen invaded southward for years. The treasury was empty and the border troops were defeated. The dynasty was in danger of overthrowing at any time. The protagonist has no foundation or military power when he first ascends to the throne, and his gentle methods are blocked at every turn. If he cannot complete the infrastructure reform within half a year and repel the foreign enemies, not only will his throne be unsafe, but the entire world will fall into war. Relying on the knowledge of modern engineering, agriculture and management in his mind, he secretly cultivated his confidants and started to break through the situation step by step, starting from improving farm tools, building water conservancy, and firing cement to strengthen city defenses. However, he was obstructed at every level by conservative officials and was almost assassinated many times. He tore off the mask of benevolence, used iron serum to sweep away the old forces, and rebuilt a new country on the ruined mountains and rivers. In the end, he succeeded in repelling foreign enemies and reviving the imperial court, but he also paid the price of infamy and sacrificing old relationships, leaving only a rejuvenated dynasty for future generations to comment on.
