I don't know of any romance novel where the female protagonist is called Lan Yaoyao and the male protagonist is the Dragon Prince, but he's also a prince. However, I can tell you some similar stories such as 'Feng Qiuhuang' and 'Chu Qiao's Biography. These novels all involved the plots of the palace and political struggles, and there were some popular male and female protagonists. If you need more information, I can provide you with more help.