A love story revolves around the 9th Princess of Western Liang as she journeys to the Central Plains to fulfill a marriage alliance with the Crown Prince. Having received overwhelming love and admiration as the 9th Princess, Xiao Feng is forced to leave the life that she has known in order to become the Crown Princess. Her husband, the black-bellied Crown Prince, holds the highest position second only to one, the Emperor. However, the Eastern Palace is the most dangerous place to be. For political reasons, the Prince has no choice but to marry the Princess from a foreign land. He has his own favored concubine while she has her own life. Two parallel lines begin to intersect in a place fraught with danger and deadly power play and buried somewhere deep inside are memories that have yet to resurface.
Xiao Feng is the beloved ninth princess of Western Liang, who enters into a political marriage with Li Cheng Yin, the crown prince of the Tang Dynasty. The latter has his own favourite concubine, and only agreed to this loveless marriage to secure his position as heir to the throne. It is later revealed that Xiao Feng had met Li Cheng Yin under the alias of Gu Xiao Wu three years ago. He was on a secretive mission to conquer the western kingdoms, and used Xiao Feng to accomplish his goal. After finding out the truth, Xiao Feng jumped into the River of Forgetfulness, and Gu Xiao Wu / Li Chen Yin followed suit out of guilt, and perhaps also love. In the present-time, only Xiao Feng has regained her memories, and their heart-wrenching romance begins all over again.