Betrayed by the Prince, I Married His UncleEpisode 40

Genius doctor Evelyn Stirling travels to ancient times and becomes an ugly girl, betrayed by both her ruthless prince fiancé and scheming younger sister. She cancels the engagement on the spot, humiliates the two thoroughly, and marries the powerful Duke Adrian Harris. The powerful couple joins forces. In the end, Duke Adrian ascends the throne, Evelyn becomes his empress, and they remain devoted only to each other for life.