They Say I Was Born a King's Daughter(2016)

After spending most of her youth fielding the attention of countless wealthy suitors, Suhee Kim finally finds true love with a steady boyfriend named Jinsu Han. But then tragedy strikes, and Suhee is murdered in cold blood.

To Suhee's surprise, she is immediately reincarnated as a baby girl named Sanghee Kim, who just so happens to be a princess! Plus, she is fully conscious of her past life. There's just one problem: in this society, women are seen as totally inferior, even princesses. Appalled by the treatment of women, Sanghee is determined to change the kingdom's patriarchal ways. Will Sanghee be able to succeed, or will she be stuck living her second life being treated as a lowly woman?

(Source: Boom Manga)