Lin Chuan, the modern county magistrate, travels back to the county magistrate of a poor coastal county in the 12th year of Hongwu. He relies on the golden finger of the "People's Livelihood Book" (effective governance → governance point → exchange for "implementable" modern knowledge) to turn a rotten county that was poisoned by Japanese pirates in the early stage In the middle period, he entered the dynasty to solve the Ming Dynasty's treasure and silver shortages, reformed finances, and promoted the opening of the sea. In the later period, the silver and national fortunes promoted the Ming Dynasty to conquer the world, and Japan, which had repeatedly violated the imperial dynasty, became the Ming Dynasty's silver mines and vassals for generations.