A good, honest ghost story that uses unabashedly cliche horror tactics to achieve its ends. Surprisingly, it is quite scary.
Set in a Korean girls' school, the plot is hugely complicated, so I'm not going to explain it here. This film pulls out all the stops in its search for scares - double-takes, creepy music, drippy sound effects, jump starts and an old-fashioned Big Twist that is very well done - I didn't see it coming at all. It has its misses, but there are definitely more hits.
Acting is good but not hugely special all across the board.
The cinematography looks pretty dated for a film only ten years old. Still, watch it if you're in the mood for a proper, frightening ghost story, the kind rarely made by Hollywood anymore.