The capital of Daqian is besieged by Northern slaves, with provisions exhausted and no reinforcements in sight. Emperor Li Zhao hangs himself to die for his country, but unexpectedly time-travels to modern times. To feed the generals, soldiers, and commoners in the city, he works as a male attendant in a club to make money, buying food and medicine to bring back to ancient times. After meeting Su Wanqing, he becomes her consultant and bodyguard, tracking step-by-step from an auction to a library to discover the Northern slaves' grain supply stronghold at Yanmen Granary. Finally, utilizing a hot air balloon for an aerial surprise attack, he burns the enemy forces' grain and reverses the war situation.