During the Tianbao period of the Tang Dynasty, Li Shande, a petty official in Chang'an, was suddenly given a task to bring fresh lychees from Lingnan. The lychee is perishable, and becomes tasteless three days after it leaves the branch, and Lingnan is more than 5,000 miles away from Chang'an, so this is an impossible task. But for the sake of his wife and daughter at home, Li Shande was determined to give it a try.

Working as a maintenance crew member on the moon, Duguyue is left behind after the evacuation mission forgets about him. A meteorite then destroys planet Earth, leaving him as the only man left alive in existence.