Although it's already the 15 episode, I'm not even excited about what will happen in the final episode.
It's watchable but I wouldn't recommend this as a must-watch.
If you have nothing to do and still want to watch a decent drama with good acting and good quality then this is the one for you.
The drama is basically about exorcism mixed with a mystery involving 2 generations. Just consider this as the introductory guide to exorcism and ghosts. (lol) anywho this is predictable but still watchable.
I only watched this drama because of actress Jang Na Ra. ( this is better than her previous drama oh my baby )

EDIT
finished watching the final episode...