First of all, i couldnt watch this drama to the end. There are two reasons for that.

When i first found this drama i was really excited about it, cause i have never watched this kind of show before (i mean korean supernatural ghosthunting). My biggest dissapointment is that the supernatural theme is not the main focus of this show. WHY, why on earth screenwriters make up some kind of political corruption plot in a noname city, when they have actually really cool supernatural ghosthunting lore??? Why? Just why... I guess koreans like politics or what, i dont really know. I really really liked the ghost hunting supernatural part of the show, why dont you build whole plot around it? Thats the first issue.

The second issue is that there is a lot of badass heroes, why they cry SO MUCH? I swear everytime the main character started to cry i rolled eyes. It was so annoying, just KICK ASSES, dont cry for god sake. I get it, koreans like tears, but do you really need the main hero to cry in every other action scene? It was so annoying.
To me it is completely wasted potential.
But to be fair i really enjoyed action scenes, combat was actually pretty cool but thats about it.