If you love show in slow but steady and really go and add artistry to fantasy story. You should check it out.
Now my thoughts,
I am really confused because show is so good and different still it's not a masterpiece becomes it had some problems with the character execution yet it is really worked will because it's so different from any kdrama ? or kdrama I watched so it can't be compared to that.
It's like mixing fantasy with artistry of melodrama visual and music. It's so wierd and slow but it got that done in perfect manner show successfully completed it greater end.
I would say show is really slow beginning and catch a phase but still go slow ? it never run. For me it's good and i love it. Not everyone will.