There are indeed some spoilers in this review but i'll try warn it everytime it's a spoiler, so people who hasn't watched the drama yet can read my review without being spoiled!

Not to lie, it took me a lot of time before starting it. I saw a lot of comments saying it becomes boring quite quickly, and what I hate the most is when a drama has a very good potential and wastes it. Why did I still watch it? Mostly because it's Park Bo Young and Seo In Guk, also because it's "the unloved one and the loving one" trope (my favorite). I wanted to give it a try and wow, I did well! Because I totally enjoyed it!

Why do some dramas become a hit while others are unloved is still a big mistery for me. I mean, this drama was (in my opinion) way better than Tale of The Nine-Tailed, with a real plot, and some very very interesting morals. The characters were realistic, the story was beautiful, and everything made sense. No big plot hole. Yet why do people keep saying it's boring or bland or not original???
It was original.
First, because when there are stories with the "good and the bad" trope, it's usually "the god and the devil". They usually are ennemies. But here, it's about a deity and the Doom itself : they're not ennemies, they work together, and humanity needs both. This was original.
It was not the classical "she was born to make you discover feelings" or "she was born to make you die" or "she was born to be your bride" or "she has the same face as your first love" or "she is the reincarnation of some old relationship". Those are all the classical tropes we see in a fantasy world with a immortal guy. Yes, they were kind of destined, but they were destined because of their choices, because of who they were, and because they would always make the same choices. She hasn't been not the "choosen one" since birth, as in most of fantasy dramas. She became the choosen one because of what she chooses, because of who she is, and that's original. The only fantasy drama with this trope was Hotel Del Luna and that's why I loved Hotel del Luna that much.
Also, it was not the usual "he can't feel anything and you will change it". He has always been able to feel things, he has always been able to be sad and happy, but he chose not to, because he didn't want to make it more difficult for him. He didn't allow himself to feel things because if so, he would always be sad, seeing what happens "because" of him. And the girl did change him, because she showed him how human he was inside of him.
(SPOILER)This is what it is about. It's not about some surnatural being becoming human because of a girl, it's about a surnatural being discovering he has always wanted to be human but didn't allow himself to do so.(SPOILER END)

Yes, there were some "WTF" moments and useless things.
(SPOILER) By which i mean the two episodes with the amnesy trope. That was a shame, cause it was long and kind of useless. A short amnesy would have been okay, cause it would show they would always make the same choices, and that's sensible. But two episodes? With almost nothing but parallels? Yes, it was kind of boring, and I used the "skip" button quite a lot during those (which is why I rated the plot with 8.5, cause it would deserve at least a 9 without the amnesia-thing). (SPOILER END)

I also saw people who thought it was stupid to see Myul Mang running to Dong Kyung and, let's be honest, it was kind of weird indeed. But then again, I wonder if it wasn't some kind of symbolic.
(SPOILER) After all, he was slowly starting to become a human through the drama (which was shown by the flower-symbolic), and that may be why he started to act a lot more as a human. (SPOILER END)

So yeah, it became less and less fantasy. The drama was a lot more about their love story and Dong Kyung point of view on life that all the "deity and doom" thing : and that's why I loved it so much. No need to have some big enormous plot to be a good story. I enjoyed so much seeing Dong Kyung going from "the one who never cries and never tells what she wants" to "the one who allows herself crying and asking to be saved".
(SPOILER) I don't remember exactly what was said but at some point of the drama, it was all about "you must accept doom in your life, so that luck comes too". Luck and Doom comes with the same face. If you forget everything about the love story, and only focus on the symbolic of things, the whole story is about a girl accepting her fate, as hard and sad it is, and because she was brave enough to accept it all, she ends up happy. And I think this is what the drama is all about, and that's why I found it so beautiful. (SPOILER END)
I love dramas with deep meanings, with double-reading, and this one was perfect for me.
I think people should try to watch the drama and make their own opinion about it. If I only read the comments about the drama, I wouldn't have watched it and I would have missed something.