The Billionaire’S Replacement Wife summary:

Read manhwa The Billionaire's Replacement WifeRiver lived in a loveless marriage for years to a handsome billionaire, Noah De Marco. His love died seven years prior and he needed a woman to become a replacement wife, to carry his children and warm his bed at night. River agreed to the agreement, secretly hoping he would someday love her for who she was, and not a placeholder for his deceased first love. But it seemed, even after six years of marriage, he never did. Finally, River must decide whether she could continue the life she had known all this time, or leave behind her husband and his children and start afresh somewhere. Would she do it? Could she do it?