The leads were AWESOME. I thought Kang Hyun was absolutely gorgeous. Her smile just radiates joy. And I loved the fact that her hair was hardly ever perfect. It made her so much more real to me. She was a little frustrating and seemingly childish at times, but I have watched very few dramas where the lead isn't. Her quirkiness is part of the charm. :) And Hyun Soo is so manly and handsome, and not in the young flower boy way. It's refreshing to watch a drama with such a mature and gentle lead. All in all, probably the most realistic drama I've seen (not too many hospital visits or life-endangering situations) and I loved watching their relationship play out.