Suterare Koushaku Reijou wa Hatsukoi no Outaishi ni Metorareru

Priscilla, the daughter of Duke Roberto, has lived her whole life preparing to be crown prince Fred's wife, but on the day their marriage is to be announced, her groom disappears without a trace. As fate would have it, the man who becomes the new crown prince as well as her groom is the infamous second prince Dill who is her first love. He had turned her confession down years prior and now he coldly states that their union is nothing but a formality. Thus, Priscilla braces herself for a loveless marriage, but to her bewilderment, Dill treats her more affectionately than expected. However, discovering the intentions behind his sweet words seems to be the least of her concerns once rumors spread throughout the palace that Dill is behind Fred's disappearance. Who is truly an ally, and who is but a foe disguised as a friend? Join Priscilla on an enthralling journey of romance and intrigue as she unravels the mysteries that surround her! (Source: MangaPlaza)