Rose Garden no Okurimono

Emilia is pregnant with her miracle baby. She had a successful in vitro implantation with her late husband's sperm. But one day, she's notified by the clinic that they had mistakenly swapped the sperm. And because of that, she is now pregnant with the millionaire Sam's baby instead of her late husband's. Sam invites an anxious Emilia to his mansion with a rose garden. He takes care of a lonely Emilia with his kindness, but she has to restrain herself. I can't keep relying on Sam. I can't keep burdening him with me and my baby when he's not obligated to do any of this. (Source: Renta!)