my Condition was completely the same as you described yours .. when the ghost-friend appears slowly from behind the trees in the painting hanging on the wall .. i just shivered and pressed pause then lifted my legs up on chair however i couldn't stop it was mixture of all romance comedy and horror i didn't want to miss it .. and the very last scene.. min Ki's hyeong talking to the ghost was simply hilarious ..i experienced so much fun watching this ^.^
AND defiantly the same cast <3 .. seriously love it ^.^