Sui Tang Heroes

At the end of the Sui Dynasty (581AD - 618AD), the oppression from the Imperial Court threw China into chaos as rebellions erupted all over the country. Duke of Tang, Li Yuan, decides to return to his hometown Taiyuan in order to avoid the dangerous political games. Meanwhile, a young priestess prophesizes a white dragon--the symbol of rulers--for the Li family. She keeps a close eye on the second son, Li Shimin.
The question remains: who would be the next ruler of the land?
(Source: Fifay.net)