During the Sui Dynasty's decline (581AD - 618AD), the Imperial Court's oppression caused widespread rebellion and chaos in China. In response, Li Yuan, the Duke of Tang, decides to leave the dangerous political sphere and return to his hometown of Taiyuan. At the same time, a young priestess predicts that the Li family would be represented by a white dragon, the symbol of rulers, and closely watches Li Shimin, the second son.
However, the ultimate question remains: who will be the next ruler of the land?
