Akuyaku Shinkan wa Sukui nado Nozomanai

Crown Prince Ian and Priestess Rebecca were once in love, but for his happiness, she let him go. Yet on his wedding day, Ian is poisoned and dies in her arms. In despair, Rebecca sacrifices everything: her love, her life, her dignity, and even time itself to save him. She succeeds, only to be branded a traitor and executed. But as death closes in, she awakens… three years in the past. Except this time, everything seems different. Will she be able to defy fate and protect the man she loves, or will destiny claim them both again? (Source: Tappytoon) Note: Includes four extra chapters.