It's got enough suspense to make you sweat at the edge of your seat, but my most favorite part was The Caretaker.
It would be good if they also added a bit of a backstory about the GwangLim Church and what horror lies in that closet.
From how the cult leader looked, he must've been in that basement for decades, with all that spell plastered on his body.
But then I kinda knew from the start that the caretaker would be the end game. This is already familiar to me.

At the end of the movie, my guess is that his girlfriend already knew that he's no longer her boyfriend the moment she saw him.
Instinct kicked in.