the movie is supposed to showcase how a mother would go through hell for her child, but wow, there are some very unsympathetic characters in this movie, that you wish they would be killed off by the serial killer. I keep hoping the mother and the producer Oh would be killed off. The mother simply has no soul in the movie.
shareI agree with you there are probably too many unsympathetic characters, but it wouldn't have been a very long movie if Ko Sun had been killed off and the producer Oh, is one of the most important supporting characters to the playing out of the story. Where the movie goes south IMO, is the number of whacked out characters, who just happen to be hanging around the studio at 3:00 am in the morning, such as the obsessed Son Deok-ta, who conveniently can remember the exact songs played and words uttered from years back (autistic savant style) from Ko Sun's program. Gimme a break!🐭
share**More spoilers**
I agree that there were some problems, like the police forgetting about the cops that are sent to her home at the beginning, her sister's death not being too much of a big deal, and all the TV journalists broadcasting it all.
However, the obsessed fan doesn't just "happen to be hanging around the studio". He was there because he was invited to since it was her very last show, and the other guest (I think it was going to be the new DJ, who had been murdered by the psychopath) couldn't make it.
He actually was autistic or had some other kind of mental disorder. You can clearly tell it from his behavior throughout the film. He already was likely obsessed with her long before the radio show even started (remember that she was a TV reporter years ago), so it's not too much to imagine that he listened to her first episode and remembered the first song that she played. The killer also knew it because he recorded all or many of the episodes.
The only other thing I think she asks the fan is what she had said about Taxi Driver, which was also a memorable night because of the way that day's caller (as it's revealed later in the movie, the psychopath himself) acted on the phone.