This drama is amazing, I've been obsessed with it a lot. The two main characters are well characterized, they both have different reasons for acting the way they do and yet they totally understand each other. Their relationship is one of the most heartwarming I've ever seen. They accept each other for who they are. All they want to do is spend the rest of their lives together, because only then can they be happy.
Seriously, after 3/4 episodes you start getting addicted to this drama! And there's nothing you can do about it! The story is fantastic, the characters are well delineated, the scenes are absolutely wonderful. As soon as you finish it you want to watch it again.
Warning, make sure you have tissues available while watching it. I cried a lot!