It's not like other kdrama. It has it's own unique story where you get fascinated to watch the drama. It's totally an entertainment drama where you find suspense, thriller, emotions and romance in one concept. If you try to watch based on the rating then I'm really sorry your missing a best drama yet far.
It's really a good watch. After you watch one episode you will be anticipating for the other episode...As far the script there are very little things which makes the drama more watchable