Chaos in the Tang Realm

In 878 AD, the Tang Dynasty still had thirty years left. Thirty years later, Zhu Wen usurped the throne, and the realm shattered into the Five Dynasties and Ten Kingdoms. Fifty years later, Shi Jingtang ceded the Sixteen Prefectures of Yanyun and called the Khitan ruler 'father.' For the next four hundred years, the Han people never regained that land. Civil engineer Su Chen, after a construction site collapse, wakes up as the son of a disgraced official exiled to Lingnan in the late Tang. No system, no space, no check-ins. His only golden finger is the knowledge accumulated from fifteen years of engineering career. Others transmigrate with cheats; he transmigrates with brains. Starting from a dilapidated border fortress, he burns bricks to build walls, digs canals to divert water, builds blast furnaces to smelt iron, and forges weapons, turning a desolate wasteland into an iron-clad granary in troubled times. Standing on the city wall he built with his own hands, Su Chen gazes at the war-torn land. 'In this life, Yanyun will not be lost.' 'In this life, there will be no child emperor.' This is a story of an engineer using reinforced concrete and imperial scheming to rebuild order in a chaotic era. — Description from novelcodex.org