Why did the female protagonist transmigrate and dress up as a man? Was the male lead the Marquis and his health not good?

I recommend the following two novels to you: 1. " Reborn Black-bellied Mo Wangfei ": The female protagonist, Xia Chu, who traveled through ancient times. She disguised herself as a man when she was young and wanted to marry the crown prince's concubine. Later, she was killed by the crown prince. After her rebirth, she found her true benefactor, the Mo King. The two of them joined forces to beat up the scum and start the road of revenge. The male and female protagonists were both black-bellied and venomous. They were happy, sweet, and spoiled. 2. [A Thousand Gold Howl]: The female protagonist is a fat man without virtue or talent, but how to turn the world around a few years later, her magnificence is full. The male lead used to be the indifferent and heartless sixth prince who played around in the world. Only his face was loved by the girls in Jingdou. Later, he was bent by the female lead and black-bellied to seek a bloody and tearful history. The above two novels match the given information. I believe you will like them. If you have any other needs, please feel free to tell me at any time.