The reason why I am helping the villainous Duke

Verona, who has possessed the body of the heroine's best friend in a certain novel, has already relived her life 21 times through reincarnation. Trapped in an endless cycle of life that feels like a cruel punishment, Verona begins to yearn for eternal peace. Therefore, Verona decides to try a method she has never attempted before: saving Deminic, the novel's greatest villain, who is corrupted by dark magic and running amok, and guiding him towards a happy ending. However, this very choice will lead Verona to a fate she could never have imagined...