I'm really starting to like the grumpy/sunshine trope!

Constance and Jonathan are best childhood friends. War from Jonathan away and he comes home 10 years later to Constance who had married, had her conniving husband leave her and carrying his child.
Jonathan gets a letter proposing marriage to Constance so her baby will have a father.

I really enjoyed them together. She slowly crumbles the walls he's put around himself and he softens bit by bit. They see the worst and the best of each other. 

But my favorite character has to be Jonathan's valet, North! He's so sly in his matchmaking schemes for these 2.