this might be one of those rare "dark" dramas... like psychological dark, and not scary dark? ^^;
I kinda got attached to this and the characters... the plot was badly executed, mainly eps 7-11 were useless... and the last 3 eps still had their draggy parts, but I liked that dark twist?
and it had a fitting ending, almost perfect for the story.. though I'd have done some things differently, but I liked that ending scene, it pulled at my heartstrings.. mostly the "evil" soul should've been a dark characterless thing? because non of the possessed people acted like the originals ;)

ps, I don't usually rewatch dramas, so my rewatch values are either 1 or 10 ;)