Zhang Yixing is the crown prince of the Mongols, who have been overthrown from their once prosperous Yuan dynasty by the Ming dynasty. He is young, handsome, and talented, yet refuses to get married for a reason he has hidden deep in his heart. Xu Feiyan is the second eldest princess of the Ming royal family, skilled in everything from the medicinal arts to dance to painting. A single visit from the Mongol Khan and his sons brings these two royal children together, and something about Feiyan