Read Marriage Alliance for Revenge Manga:
Olivia, the Empress of Rhone Empire, died because of her husband's scheme, then she had a chance to live again in the body of an unknown woman who lived in a slum. After that, Olivia met her ex-fiance, who was the real heir to the throne, and hid her real identity from him. She made a suggestion to form a marriage alliance for each other's revenge. Will their revenge succeed without any obstacl more.. e?