Fang Zhengyi, a young man from modern times, travels through time to Taoyuan, a remote and impoverished county in the Great Jing Dynasty. Using modern knowledge, he creates advanced innovations such as asphalt roads, flush toilets, newspapers, gunpowder, and sweet potatoes, transforming the poor little town into a prosperous place where the people live comfortably. After secretly visiting the county and witnessing Fang's extraordinary talents, Emperor Jing summons him to the capital to serve as Junior Chamberlain of the Eastern Palace. Using unconventional methods, Fang teaches the rebellious Crown Prince and challenges conservative officials who preach benevolence and righteousness without taking action. He uses gunpowder to blast open a mountainside and resolve the devastating floods of the Jian River. From mutual suspicion to becoming close friends, Fang and the Crown Prince join forces to overcome floods, food shortages, and other crises, shaking up the imperial court and ushering in a new era of reform for the Great Jing Dynasty.