From the Start, Guarding the Wilderness? I'll Conquer the Capital with Infrastructure!

[Transmigration] [Infrastructure-Building System] [Farming and Pioneering] [Saline-Alkali Soil Improvement] [Defending the City and Crushing the Barbarians] [Building Ancient Cities] A modern infrastructure expert transmigrates into Xiao Yan, the Great Yan's seventh prince. His mother died young, leaving him without power or influence, and the entire court mocks him as a useless fool. After accidentally offending the Crown Prince, he is cast out by his cold-hearted father with an imperial decree and sent to Yunhuang City, a desolate land buried in yellow sand and overrun by barbarians. The Crown Prince secretly colludes with the barbarians, corrupt officials exploit the people, and the city's residents are starving and freezing. Everyone is certain Xiao Heng won't survive six months. At this moment of utter desperation, the God-Tier Desperate-Frontier Infrastructure-Building System successfully binds to him! Improve saline-alkali soil, irrigate with waterwheels, and build greenhouses: end famine across the entire city within a year; Make cement to build towering walls, mass-produce weapons on assembly lines, and lay out a grand defensive formation: transform the desolate city into an iron fortress; Smelt steel and make cannons, train troops in modern fashion, and use brilliant tactics to encircle and annihilate the barbarians: all the nomadic tribes bow in submission! The useless prince whom anyone once could bully now commands a million elite troops and rules over a thousand miles of prosperous frontier. The Crown Prince schemes in the capital, and the officials watch coldly from the sidelines, only to receive news of Xiao Heng sweeping away the barbarians and shaking the world! The emperor regrets everything, the Crown Prince is too anxious to eat or sleep, and the officials rush to the frontier overnight to bow and curry favor. Standing atop the mighty fortress, Xiao Yan sneers: You abandoned me in a land of death. Now I'll take this whole realm with my own hands!