Marriage of Convenience to an Obsession (2025)

Blurb:
Olga devotes a thousand days in prayer for her husband to sit on the throne, only to be killed at the hands of her cheating husband. The goddess brings her back as her half-sister for a second chance at life, but she still finds herself at the risk of marrying her murderous and adulterous ex-husband once again. Her only hope is to propose a marriage of convenience to the Beast of the Duchy, but a strange turn of events leaves the reluctant duke little choice but to accept the offer. Now, the unlikely newlyweds face struggles on both ends – avenging Olga’s death and figuring out how to share a bed together.

Source: www.anisearch.com/manga/89474