Suterareta Seijo wa Saikyou Ouji to Boukun Maou ni Aisareru

Original Webtoon:
LINE Manga, eBookJapan

Official Translations:
Korean
Hated since birth and raised in confinement as a "Cursed Princess," Iris wears a mask sealed by a curse, living each day with no hope. She accompanies her younger sister, Diane, who possesses exceptional healing abilities, to her wedding, but is left alone in a dangerous forest! Attacked by monsters and bracing herself for death, she is rescued by her fiancé, Prince Leon. Her days as her sister's stand-in are filled with new discoveries and happiness... but when her sealed abilities awaken and she accepts Leon's advances, the Demon King Zaid, who claims to be her true companion, kidnaps her...?!