Tbh I had high hopes for this one. The premise itself was fresh to the world of kdramas and not to mention it was from OCN which pretty much has some of the best thriller/crime dramas around.
But unfortunately, this one didn't work too well for me for several reasons .

-Stuff that I didn't like:

*Messy plot- I feel like the script writer had this great idea on how to keep things in suspense and build the tension and shit but it didn't translate that way on screen and ended up just being frustrating . The reason I first dropped this in the 10th ep was that it just kept on dragging along in circles without any sort of major discovery. Up until then I had to force myself to complete an episode. Luckily though, it did improve a lot from then on wards , but that doesn't make up for the fact that they just wasted all those eps without getting to the point.

*Under utilization of certain characters: I'm talking about Yook Gwang (hyung) and Detective Goh here. Those two characters could have definitely been of more use . Especially Detective Goh who was kept in the dark way more than necessary. Both of them could have worked together with the 3 leads as a complete team. Also they should've been made to interact more with each other - felt like they missed great opportunities for some comic relief there. Not to mention that if a season 2 is in the works killing off Yook Gwang hyung wasn't really a necessary option, in my eyes that is.

*Mateo- I watched The Guest for Kim Jae Wook but the entire show I was left feeling sorry for him. Such a talented actor but it was a waste for him to take on this role. There was nothing that drew me to his character. I'd dare say that he was even more of a bland character than Yoon hwa pyung. The amount of times I had to face palm myself because his emotions clouded his reasoning . Though I could understand him it was frustrating to see him go back and forth on whether he should just trust hwa pyung or not, and he pretty much had no tactic at all -we see that when he interrupted the mass by Father Yang to confront Park il do, which in my view was a pretty stupid thing to do without thinking of its consequences.

*Centering on Yoon Hwa Pyung way too much: I wished they made the story in a way that it would center on the 3 leads equally. There was too much of needless focus on YHP (who wasn't really a spectacular character to begin with) leading to some characters like Mateo who had the potential to rise up not being able to.

* The same with Mateo , the three leads were way too emotional for my liking sometimes.

- However the drama wasn't a complete failure
there were things I did like, such as:

*The ''possessed'' acting from the side cast- This is something NO ONE can argue about! These people literally carried the show almost taking away the spotlight from the main leads. They reminded me again and again why I could never become an actress -like how do you act all out in front of the camera and entire crew like that?? Especially in those exorcism scenes where they have to scream, "PARK IL DOOOO!!" and throw up all that water while the main three leads watch you do that ( let me tell you if I had to do that in front of Kim jae wook, I'd pretty much die of embarrassment lol)

*Kim Dong Wook's acting- I've never kept tabs on his previous works so I didn't know what to expect, but the man absolutely outdid himself. It didn't feel like he was acting at all, just actually living as Yun Hwa Pyung in the way he talks, laughs, cries , etc... Also that difference in expression when he got possessed by PID was clear and distinct from YHP. His character itself was nothing great in my opinion but Kim Dong Wook's acting made him really lovable.

*Kang Gil Young- Newest entry into my list of girl crushes. Unlike the plot, her character was written pretty well. I love how they made her the most physically strong out of the 3 leads (yes, I enjoy seeing females kick ass) and I adore how she's her own person and doesn't take shit from anyone. Also her partnership with detective Goh is one that I looked forward to seeing in every ep.

*Chemistry between the 3 leads- I dropped the drama in between and picked it up after so long cause I missed their friendship ( should have added that in one of the tags) . It was the thing that actually managed to save this whole show. The sea scene in the last episode with Mateo and Gil Young trying their best to save Hwa Pyung was pretty legendary I'd say .

*Park Hong Joo- she was just weird . But it works so well on her I couldn't hate her XD. She'd probably go down as one of my favorite female characters/villans

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Anyway all the OST's were really nice especially 'Somewhere', so I'll be listening to that a lot.
I don't really re-watch a lot of dramas , especially ones like this that have their story all over the place, so yeah the re-watch value's pretty low for me.

Thanks for reading!