I was so hyped for this drama when it started, the first episodes were nice and i liked where the plot was going, but then it got boring, and most of all, don't try to produce a drama that requires a lot of visual effets if you're going to botch it the way they did for this drama. It just got cringy - due to low level visual effects, the plot stalled, the actors weren't so great - it pains me to say this but even lee seunggi couldn't save the day - and overall i couldn't even make an effort to watch the last episode.
Disappointing. Giving it 6.5 stars is generous i believe, don't bother with this drama if you're looking for something that gives off "the goblin" feels.