The Archmage Becomes the Swordmaster's Youngest Daughter

Rosette was a mage and assassin who lived as a mere tool, mistaking control for love, until her choices led her to kill Duke Adrian, the Empire's legendary swordmaster. Haunted by regret, she uses ancient magic to send herself back in time and fix everything that went wrong. However, although she succeeds in returning to her childhood, she ends up being adopted by the very duke she murdered in her past life. Will Rosette's knowledge of both magic and the future be enough to rewrite a tragic destiny and change fate itself?

(Source: Webtoon Entertainment)