The Little Swallow That Returned the Pearl Fell into the Well

Is There Any Kind of Book Where the Heroine Is Very Coquettish and the Harem Is the Only Favorite in the Later Period?

I want to read a book like "After Entering the Palace, the Paranoid Emperor Forbids Me to Leave the Palace". After reading Mikakyo's books, I have recently fallen in love with Gong Douwen, so I wanted to see if there is a female protagonist who is very cute but not stupid. If the male protagonist is older, he can be emotionally involved in the early stage and become a doting one in the later stage.