I'll Change the Ending With Education

Killed when her employer, the drunkard Timothy Reynold, is accused of treason, Agnes May Graham wakes up 14 years in the past. Eager to change her fate, Agnes becomes young Timothy's tutor in order to guide him toward a better path. However, she soon learns Timothy's misbehavior stems from the negligence of his guardian and her killer, the distant Duke Ethan Battenberg. Educating children is Agnes' expertise, but how can she solve this problem when it's her employer who really needs a lesson? Original Webtoon: KakaoPage, Daum Official Translations: English, Japanese