Zhao Chen, a young man from the modern world, accidentally discovers that the wardrobe in his home connects to the ancient Great An Dynasty. From then on, he begins trading goods between the two worlds. Using modern industrial products, weapons, electricity, and other advanced technologies to gain an overwhelming advantage in the ancient world, he starts by eliminating bandits, then builds a private army, organizes an exposition, and amasses wealth and political power, gradually rising from an unknown merchant to a county duke. After marrying Bai Shu, navigating his relationship with the Prince of Qin, fighting off assassination attempts by the Black Dragon Society, and resisting the enticements and schemes of various court factions, Zhao Chen uses technology as his spear and money as his shield. He relentlessly expands his fiefdom amid the struggle for power, determined to build a commercial empire beyond even the emperor's reach.