i stopped watching after the fight scene in the police station, ive never seen anything more stupid in a Korean movie. All the def girl and her mom had to do was to tell the police to watch the damn CCTV that would clearly show the killer pulling out the knife and attacking the brother first. Not to mention it took literally forever for the girl and her mom just to pull the police (who were right outside) inside to stop the fight. And when the police finally came in to stop the fight, the girl and her mom didnt even bother to point it at the killer, they just let the police tase the brother as if they saw nothing.
No serial killer in any sane movie would pull out a knife and attack in a police station anyway, this movie has no common sense, it's rather a fantasy.