Yakusai no Ouji wa Nisemono Koujo wo Goshomou desu

Reincarnated with memories of being the founder of magic, the noblewoman Lischette is exiled from her duke’s household for possessing no magic and deemed an imposter. Rescued from the brink of death by Prince Lucius, a feared figure unable to control his magical destruction, she agrees to become his tutor in exchange for protection. Together, these two outcasts forge a powerful bond and use magic to rewrite their cruel destinies.

Original Webtoon