Kataware Reijou ga Dansou suru Riyuu

The Lowreis family was wrongly sentenced to execution for attempting to murder the royal family. As Linali Lowreis, the daughter of the family, is on the brink of death, she fervently prays for a second chance. Miraculously, she wakes up three years in the past, reuniting with her deceased family members. However, tragedy looms as her brother, Liam, is poised to attend the School of Poltis, the reason for the family's tragedy. She begs her father to send her instead of her brother, as she is better at sword fighting. Now, faced with a new identity and unexpected challenges, Linali must attend the School of Poltis in her brother's place.

(Source: WEBTOON)