Lin Xiao, an ordinary social animal in modern times, lives a life of being squeezed by his boss and making things difficult for his customers. After working overtime continuously, he was exhausted and hit by a mysterious ancient clock that suddenly fell on his way home, causing him to faint on the spot. After waking up, he found himself in a strange ancient military camp and became an unknown soldier. Through communication with people around him, he learned that he had traveled to a dynasty called Daxia, and that the emperor was a tyrant who was tyrannical and extortionate, and the people were miserable. By chance, Lin Xiao accompanied the army to escort the tyrant. On the way, he saw the tyrant's arrogant and lewd appearance, and felt disgust in his heart. In order to get out of the current predicament, Lin Xiao relied on his military knowledge in modern memory and performed well in army training. He attracted the attention of his superiors and was promoted to squad leader.
However, in an accident, Lin Xiao accidentally collided with the Tyrant's frame. The tyrant was furious and wanted to behead him in public. At the critical moment, Lin Xiao came to his senses, took out the lighter he brought from modern times, and lit a branch in front of the tyrant. The tyrant had never seen such a magical thing, so he temporarily spared his life and took him as a handyman, but in fact he wanted to further study lighters. Lin Xiao witnessed more evil deeds of tyranny beside the tyrant, and gradually came up with the idea of overthrowing the tyrant.