Looking for a webtoon

Its about a girl who was hired to imitate a nobles daughter in high society, but then when they are done using her they try to kill her. While running away she somehow get transformed into a young girl. She gets hired at a dukes(?) place as a maid. Only she and this duke were enemies when she was the 'noble lady'. So she is trying to hide her identity while somehow getting closer to him and one thing leads to another and she becomes his fiancee?

Any help would be appreciated!!