Watching this drama was a bit like riding a rollercoaster - it veered from intense and thrilling to the 'flat' bits and confusion!

I was really enjoying it until one particular scene that just threw the story into the realms of being totally unbelievable.

Fantasy, supernatural etc dramas, still need to have a sense of reality in terms of a storyline being possible and that one scene in this, I felt shifted that. If one character hadn't done something to themselves at a crucial point, which just didn't fit with what happened next, this would not have been the case. That aside and the story would have been excellent, although the way some of the characters think (or don't, more to the point), is sometimes infuriating too.

I was gripped, and besides being very irritated by the number of times people can be in pain or passed out, whilst everyone in the vicinity appears to be completely oblivious to the fact, was able to stayed engrossed whilst watching.

The main characters are all so deep and multi layered. I did find Jung Ha Eun to be somewhat delusional on occasion and Jung Sa Bin had a tendency to be gormless at times when her usual intelligence was called for.
There are some truly psychopathic characters in this drama that are very easy to hate. Considering that, the writers did well in managing to not make it so bleak as to be unwatchable. It was balanced by very touching, kind and warm scenes too.

I had no idea how it would end until the final episode played out and it was not a disappointing, but as is often the case, for some reason they decided to add a tiny scene to what would have been a great ending, which made it less clear - at least to me . The positives of this drama do outweigh a story that became confusing and (as mentioned before), overdone at times.

The cast though are excellent. I loved Jang Ki Yong and Lee Soo Hyuk's portrayals of their dual roles a lot.
I also thought the music score suited the episodes really well too.

Worth watching.