Husband Forgets Me, Who Was Thrown into the Sea, for a Country Bumpkin

From the back cover

Everyone in the city knows Julian is utterly obsessed with Eleanor. Married eight years, she still endures the family elders' criticism for having no children, and Julian defies his grandma's demands to divorce and remarry, insisting Eleanor is the only one for him this lifetime.

Then his grandma brings a girl from her hometown, Brooke, and pushes her at Julian. He calls her a country bumpkin, unworthy of a strand of Eleanor's hair. Yet two months later, Eleanor overhears the staff gossiping: Brooke is already pregnant. When Eleanor suggests divorce, Julian kneels in the pouring rain, swearing he was drunk and mistook Brooke for her. Six months on, she finds him at the hospital for Brooke's prenatal check-up, hiding her in a suburban villa under his grandma's threat.

When kidnappers seize Brooke by mistake, Julian begs Eleanor to take her place, calling Brooke the carrier of the Julian family heir. He shoves Eleanor toward the kidnappers, then runs to Brooke without a backward glance. Bound and thrown into the sea, Eleanor sinks into darkness.