Marriage Alliance for Revenge

Olivia, Empress of the Rhône Empire, died as a result of the schemes of her husband, the Emperor, and wakes up in the body of an unnamed woman in the slums. The next place she goes to is the home of her ex-fiancé, whom she had separated from, Duke Lucas, the "true" heir to the throne whose position was stolen in a coup d'état. While concealing her identity, Olivia proposes a marriage alliance to Lucas for the sake of each other’s revenge. Will the two succeed in their quest for vengeance?