At the beginning, I really loved this show. I thought it was, overall, a really good plot with interesting characters. Contrary of what most reviews say, I think the main couple chemistry was good enough to keep me going. I won't say much about the cast and music because they were good and I think they did their job.
But what really bothers me is that it seems writers never fully decided if this was going to be a mainly romance show or a fantasy one. I really liked how tension was built when Imugi reincarnated and the general idea of the character. Nonetheless, I simply couldn't stand how he was out there, literally killing people, where the main couple was out there having... dates. Imugi's steps and moves were so predictable, yet the main characters always seemed so behind him. Because, like I said, they were busy walking down to the park or stuff like that.
I love shows filled with romance. They're my favorite. But I think most of their scenes were unnecessary. They kept saying goodbye to each other to then changing their minds over and over again. Besides from that, there are A LOT of questions and things that never got a proper answer. I'll never understand how, in a world that seems like it's full of ghosts and guardian spirits, no one seems to care about Imugi besides the male lead. Imugi threatened the world and yet, nobody appeared to stop him. That didn't make sense at all.
Another weird thing is how they made her parents come back. They were away for decades just to be put back again in their old lives like it was nothing. They deserved a proper development since they were the main motivation for the female lead. They were the reason she lived at first and then appeared to be mere decorations.
Ok. So far seems like I hated this show, but I truly didn't. The beginning was so good and I could never drop a work from Lee Dong Wook. I loved how badass the female lead looked like at first. I loved the side characters and their relationships. I loved all the deity stuff. But the decisions the writers and director did.... I'm sure they still don't make their mind. The ending was all over the place.
Anyway, I think it's a good show if you know beforehand that the middle/ending is not well thought. I still believe is a pretty story, but that it could been told better.