The atmosphere of mounting dread is matched by just-right performances, design and camerawork.

This is a carefully structured film about grief and guilt, as well as horror. They don't resolve every disturbing moment or confusing element: they leave some questions hauntingly unanswered.

The film feels haunted by the relationship between Im and Moon, who cling to each other in the face of a hostile hostess, even though that may not be their best option.

A great piece of alchemy, in which everything we learn makes the film much sadder than it seemed when it was a jumpy horror film, but also in a way much more horrific.