The two main characters were kindred spirits in which their love story was gut wrenching and pure. The soundtrack was beautiful. Actors? Acting? A1! But the storyline was so unrealistic (even as a drama) that it became infuriating. To have have a demon have such extraterrestrial powers they never would have in reality with the never ending ability to wreak havoc and chaos was irresponsible and frustrating. Even as a shaman, the main female character was POWERLESS to stop the demon. In the end, I guess the message was that Good wins ultimately. But after how many casualties including the wipe out of the main cast? I’m left feeling lost and slightly annoyed at the story writers. This is amongst my favorite genre but now I have trust issues. I would guess the attitude towards the viewers was a bit sadist. If it ended anything like ‘The Guest’ for example, I would have felt GOOD actually won with somewhat of a happy ending. Tragic that they all perished. The only closure was that they met again in their next life.

I'd like to add that the first Hwang Daedu was literal sh**. He was already an evil person to begin with who worshiped and summoned the bastard from the dead. It was pleasing to see him gone.
The 2nd H.d.d played him perfectly. the laugh, the annoying wicked smile and voice was all similar. (Yoon Junghoon did fantastic. not trying to glorify his terrible character btw)
the 3rd Hdd was the worst imo.(even though the actor did amazing with playing two possessed individuals alongside his own character) The writers just completely forgot who Hdd was. He went from being someone with OCD who only kills methodically to randomly offing anyone in his path. It didn't make any sense and the drama completely lost its continuity. Having him have some kind of emotional moment in the end was worthless. You can't feel sympathy for evil. Plus he wasn't trying to change at all. he used his past to garner sympathy and make his targets loose focus.