Is there any drama that has a reverse harem like Cinderella and the four knights but done better?

  • Hwarang
  • You're beautiful
  • Hana kimi
  • Moon Lovers

Try:

  • Mr. Sunshine
  • Oh My Baby
  • Go Ho's Starry Night
  • Bu Bu Jingxin
  • Flower Boy Ramyun Shop
  • Was it Love - though this aggravated me at one point with its How I meet your mother narrative 

You might like Atashinchi no Danshi, though it's not as romance focused as Cinderella.

Hajimete Koi wo Shita Hi ni Yomu Hanashi 

If you are referring to dramas where the FL has more than one male interest

Sound of the desert 

Imperial doctress

Meteor Garden

Boys over flowers