Li Muyuan, an academician of the Chinese Academy of Sciences specializing in both physics and chemistry, transmigrates to the Tang Dynasty in the third year of the Zhenguan era after an accident during a nuclear fusion experiment.
Faced with a Great Tang in desperate need of rebuilding, he draws on scientific knowledge from more than a thousand years in the future. In three years, he increases grain production tenfold; in five, he builds steam engines and railways; in ten, he develops firearms and airships.
Li Shimin goes from suspicion to trust, from trust to dependence, and finally willingly abdicates in favor of a worthy successor. Princess Changle, Li Lizhi, devotes herself to Li Muyuan, while Empress Zhangsun treats him as her own son.
When the Turkic cavalry is shattered by cannon fire, Arab scimitars are snapped by machine guns, and Roman formations are crushed beneath tanks, the whole world trembles under the iron hooves of the Great Tang.
Fifteen years later, Li Muyuan stands atop the walls of Chang'an, looking at a world map bristling with dragon banners. Beside him is the pregnant Princess Changle; behind him stands Li Shimin, who has voluntarily abdicated and become his adviser.
As the declaration of a “community with a shared future for mankind” resounds across the globe, this emperor from the laboratory knows that what he will bring to the world is not conquest, but civilization.
