Kool_lampshades's manga / #Revenge(3)

Girl dies repeatedly at the hands of the tyrant, and travels back in time to a week prior.

So great, omg. Ok, so a horrid princess dies and makes a contract with a demon to keep living in her place, so that revenge can be had on her step mother who poisoned her (the step mum did this partially because she wanted her son to inherit the throne, and partially because the horrid OG FL slapped the innocent step-mum's daughter). So, the demon does and begins rekindling the FL's rep, while assuming the position of leader of the 4th knights, and befriends one of the country's leading swordsmen and his friend. The swordsman I assume is the love interest

Illegitimate noble daughter helps seventh prince become emperor, motivated by affection provided to her by him that she'd never received elsewhere. She is falsely accused of attempting to hurt a princess, and is kneecapped and incarcerated. 5 years pass and she is visited by a count who forces a kiss on her (yuck) in so doing transferring mana to her sufficient enough for her to escape. She does so, finds him, and when asked why he helped her, he says he wants her to kill the emperor for him. He reveals himself to be the last descendant of the former royal family. Her soul is transferred via magic into a different, healthier body. She fakes the position of his lover to better carry out their plan. It's pretty obvious that they'll actually become lovers by the end.