Looking for books of any genre where the protagonist used to be a terrible person, and has changed for the better, but still has to cope knowing what they previously did.

Essentially the title. I'm looking for books of any genre of fiction where the protagonist used to be a terrible person and hurt people close to them, before bettering themselves and changing into a better person. However they still have to find a way to cope with the memories, the things they had done, the people they hurt, etc.

Thank you so much