Happiness of the Holy Maiden's Fresh Start

Seyra, a saintess with powerful healing abilities, was betrayed by her sister and fiancé, falsely condemned as a witch who murdered a duke, and met a tragic end at the guillotine. However, she finds herself returned to seven years earlier, before her engagement! Determined not to repeat her previous life of being exploited and living as a foolish puppet, Seyra vows to protect the duke, who was dragged into her fate and killed. Concealing her powers as a saint while using her knowledge from before her regression, Seyra fights to change her cruel destiny!

Original Webtoon: MechaComic, Comico