A modern soul transmigrates into Louis, an unloved, useless prince of the Great Xia dynasty. From the start, all he has is a dilapidated fief and a gentle wife, Su Qingyao. Fortunately, with the support of an “Assistance System,” he starts by improving farm tools and developing agriculture, gradually building up his strength. He recruits soldiers and horses to quell rebellions on the frontier, carries out reforms and puts the government in order, campaigns south against the Baiyue, opens trade routes west to the Western Regions, repels the Xiongnu in the north, and guards against Japanese pirates in the east. Step by step, he rises from a prince on the border to the ruler of the realm. In the end, he ascends the throne in accordance with the late emperor's edict, inaugurates the “Yongxi Golden Age,” and makes Great Xia a world power before which all nations come to pay tribute. The story offers not only the fiery struggle for supremacy amid the clash of arms, but also the warmth of Su Qingyao and him supporting each other through thick and thin, along with a devotion to governing diligently and benefiting the people. It tells the legendary life of a discarded prince who becomes an emperor for the ages.