The Useless Duke’S Daughter summary:

When May opened her eyes, she found herself stuck in the body of Evangeline Amelia Alcmene, the infamous, useless heroine in an unfinished webnovel she was reading before she had died. Unfortunately, the novel world she lives in is doom to be destroyed in a few years by an unexpected betrayer. Realizing that the fate of the world rests in her hands, Evie has no choice but to undertake the role of the savior, bravely stop the villain's plans and save the world.The Useless Duke's Daughter Saves The World