E-commerce entrepreneur Zhang Feng is betrayed by his fiancée and business partner, leaving him with tens of millions in debt. Returning home in ruin, he accidentally activates an ancestral compass, gaining the ability to travel back and forth between modern times and the Jiajing era of the Ming Dynasty. Shuttle between two worlds to resell goods and accumulate capital, while founding the Zhang Family Firm in ancient times, taking root in Liuao to build military fortresses, train local militia, and develop agricultural and commercial workshops, joining forces with the prefectural governor to ward off Japanese pirates, and fighting against pirate gangs and colluding treacherous merchants. Meanwhile, maneuvering against antique underworld forces in modern times, defusing betrayal plots, and fighting Japanese spies. A dual-line game of chess across time and space, writing a legendary counterattack of guarding the home and defending the country.