Jiang Chen is a construction site worker. One day, while working hard to buy a bag for his wife, his unfaithful wife brings a wealthy young master to appear before him and publicly humiliates him, but he is too cowardly to talk back, and can only drown his sorrows in alcohol alone at night. The beer bottle he casually throws away unexpectedly gets transmitted through an ancestral mirror into the bedchamber of the emperor of the Dali Kingdom two thousand years ago, while at that moment the emperor of the Dali Kingdom is feeling vexed and irritated because the empire is being invaded and he himself cannot go into battle to kill the enemy. In his anger, he takes off his crown and throws it far away, and who would have thought that the crown would also pass through the mirror and instantly wake up the drunk young man, so the two of them thus discover the secret of the mirror and exchange lives.....