This was my first kdrama. It will always be my number one suggestion to anyone. It's just too good. Any genre, you name it and this drama has it.
The best part was, in every other supernatural drama mostly the one with the super-powers faces the end and the human is left behind (although every time they come back from out of nowhere at all) to struggle alone and there is tons of crying. But this drama was special, because it was something different. The human died which made it far more interesting and senseful than the endings in other dramas.