Pretty sorry story. It had potential, but just failed to deliver. The best part was both of them getting the courage to admit their love, even if it was way later than it should have been. The worst part was them not caring a whit about the death of their baby. It was really like an, 'Oh, well, that's too bad. So what's for lunch?', level reaction.
Girl falls in love with her sister fiancée. The sister does something shitty and the engagement ends, and the guy sleeps with our mc. Guy then feels guilty and so they get a fake marriage ;) somewhere along real feelings start to form... but will they be able to air them out, or will they forever remain a secret desire?