The King's Affection(2021)

When the crown prince's wife gives birth to twins, it is considered an ominous sign and the order is issued to kill the baby girl, but her mother secretly sends her out of the palace. A few years later, when the baby boy dies, she returns to the palace again, and now she has to play the role of her twin brother, Prince Lee Hui (Park Eun Bin), and no one knows her true identity, which is a woman...