It has an excellent plot executed by wonderful actors. And I feel the one thing to carry away from this drama is to never hold back one's affection towards the people we love. I doubt I've ever come across any drama that was similar to this one.
Having watched several korean dramas over the years, recently as a show begins to near its end i tend to lose interest and discontinue watching as they begin to get predictable.But this I don't feel happening with this show. Not only is the premise of this show fresh, it is carried through brilliantly by its actors especially jang hyuk who amazingly brings out the emotions in you despite the emotional handicap of his own character. It's definitely worth a watch with some excellent twists in the plot.