OK but not good enough if you are looking for a Drama that can run your feelings like rollercoaster than this drama is good enough beside that. the story , there's big holes that makes you lose all the immersive feelings after watch. there's still big question thats not answered because some variable are totally doesn't make any sense at all. it is fantasy. but writer should have enough answer to any kind of variable question that viewers may had. if we compare to another kdrama with similar fantasy . such as "W". they have enough answer to any kind of variable that viewer may had. its OK. but not good enough .