This inn is the rumored location of a lost city buried under the desert, and its hidden treasure would only be revealed by a gigantic storm every sixty year. The gang used the inn as a front to locate the lost treasure.

The storm is arriving. But the situation becomes more complicated when a pregnant concubine who escaped from the palace came to the inn. The concubine was saved by a mysterious woman Ling, and the two fled to the Dragon Inn in hiding. Hot on their trail were the Imperial Assassins led by the powerful eunuch Yu, followed by the righteous general Zhao who was determined to take down Yu to restore order in the palace.