😋According to the information you provided, I recommend a novel to you. It's called "A Beautiful Woman in Power." It's an ancient romance novel. The plot is very similar to what you said. The female lead is also a princess of a fallen country. In order to take revenge, she married the emperor and used a fake name called Nanxi. The male lead, Xiahou Yuan, was a mysterious big shot with ulterior motives. The plot of this book is very well designed. It will definitely make you enjoy reading it! I hope you like this fairy's recommendation. Muah ~😗