Anyone know the title

I don't know if it's here alr but i read it on different site, this manhwa is in historical and fl is marrying to a duke who have son already, they did a contract marriage and the duke i a womanizer keep seeing other woman for sex , 1 time he invited the fl to watch him have sex. They never had sex in their whole marriage till the duke request to annule/cancel their marriage, fl approved and the son has his eyes on her already so at night he came to fl room at night and did her service .. u know u know. Then after that , duke invited fl to some restaurants or cafe then asking to start over. Please help me i lost the sauce.