Modern man Li Yan traveled through time and became the emperor of Daxia. The late emperor was obsessed with beauty, favored the queen's relatives, emptied the treasury, alienated virtuous officials, and the dynasty was on the verge of collapse. After waking up, Li Yan decisively eliminated the rebellious parties, re-employed good generals, set up royal guards to rectify the court, and improved weapons to defend against foreign enemies. He led his army to conquer the four directions, pacified the various countries, shocked the tribes in Mobei, unified the world, was supported by the tribes from all directions, and created a prosperous and peaceful age.