I started this drama 'cause it was for a long time into my watchlist but didn't meet my expectations..
I'll start with the PRO:
- The plot is really good and also something new. Rarely I see religion themes on KDramas, and even more rarely a full drama based on these things.
- The cast was really good, the ''Spiritual Father'' was portrayed perfectly and also really creepy in many scenes!

And I'll also start with the CONS:
- Many religious scenes were really, really boring, I've skipped 90% of them since they were pretty much repeating...
- The real part of the story starts to develop after the 7th episode before this is just a long moment of how they get into the cult, where the place is, what the do, and also a lot of praying scenes.
- The last three episodes were rushed and confusing, everything starts to come out in less than three hours (secrets, dark pasts of the people), things that actually needed a little of the background to make everything be easier!
- Really few action scenes, even though is more on the psychological side, I was hoping for more actions scenes, I don't know something like the police ones or something about an investigation, but nothing or let me say it, just a very small part of this has been made.

At the end i can say that isn't that bad, but if you're searching for something like 'Signal' with a really good tension, personally, this isn't the one in charges neither if you hope for a little bit of romance in it...
Not bad, but i wouldn't rewatch it again.