I was surprised to see Hwang Jung Eum and Park Seo Jin working together so soon after Kill me, Heal Me and especially as romantic leads but they are both good actors and they are definitely showing those skills in what I have seen so far in the drama.
I have also been nicely surprised about the theme of the drama. This could easily be a simple funny drama about a guy that grew up handsome and a girl that grew up comely and the random shenanigans they they get into, but the writers are going deeper. They are showing that a person's looks does not determines the worth of a person. It's a good message and it is also something that people all over the world and maybe specifically Korea should listen to.