So-young: Who becomes a cop to find a first love?
Hyun-ki: Me! *raises his hand*
So-young slaps him on the back of the head.
A big part of the problem was the decision to cast notably attractive and distinctly young actors into every role (there's just one middle-aged actor in the entire cast) and to coif them all in the same hair styles. When every character is young, comely, has dark brown eyes and straight black hair, i.e., looks like every other character in the movie, it's hard for the undiscerning Western eye to follow who's who. And when you can't keep track of the characters, it's real hard to follow the plot.
This is another good South Korean horror film.