Please recommend an ancient romance novel with a wonderful plot and mature writing style.

There was really a shortage of books. The tastes here were very mixed. For example,"Do You Know?","Imperial Industry","The Eastern Palace","On the Fall of the Crown Princess", regardless of whether it was a beautiful girl from a humble family or a grand and magnificent style, the key was that the writing had to be mature and the plot was good. Previously, when he saw other answers such as "The Imperial Wife" and "The Troubled Beauty", he wanted to say that these kinds of novice writing were really bad. The plot was also full of loopholes and could not follow the author's train of thought at all. thank you ~