I thoroughly enjoyed this twisty-turny story, with not a few butt clenching moments ;D
Oh Jung-se really suited the role of Yeom Hae-sang and the more I see of him in such diverse roles, the more I love him (his autistic character in It's OK to Not Be OK is still a favourite).
Kim Tae-ri is always good and I loved Hong-kyung as the young Detective.
The entire cast were actually very good and there are several well known supporting actors I always enjoy watching, which helps!
The characters' journeys to discovering the mysteries surrounding an academic's investigation into crimes with a supernatural base and spanning many decades, are gripping.
There are shocks, tragedies and a very dark and brutal catalyst to everything that happens subsequent.
There are, unfortunately, also the usual issues of characters not listening, acting alone, making decisions for others and just not communicating in instances when 99.999999% recurring, of people would.
It's a drama and the story needs that to move forward I suppose, but the writer could have thought of more engaging alternatives in those instances.
I also found Kim Tae-ri's character's attitude towards Oh Jung-se's, later in the drama, to be utterly ridiculous, given everything they'd gone through upto that point and given her own predicament.
I wasn't scared by this drama (although it takes a lot to frighten me), but, as said, it did have its moments.
Cases of people that are already wicked or bad in some way, attracting angry/hungry spirits to them, seems to be becoming a trope (that's not a complaint).
There are instances of child abuse, however, so anyone for whom that's a trigger, needs to be forewarned.
I probably wouldn't watch it again, but am by no means sorry I picked it.
It is worth watching.