Xiao Chengyan is the nephew of the current emperor of the Xia Dynasty. His father is the emperor's younger brother, King Xiaoyao, and his mother is the daughter of the brave general Dingguo. But when he was still in his mother's belly, his father arranged a marriage for him, saying that he wanted to repay Doctor Liu for saving his life? However, who can explain to him why Dr. Liu's wife gave birth to twins! Although he is a young prince, he only plans to marry a real wife...