Let me give the conclusion first: the professor is the murderer, and the psychologist is the mister.
Why the professor is the murderer: If we assume that the psychologist is the murderer, then he should have 7 strands of hair (a few missing girls can see the background board of the last police conference, there are 7 girls in total), while the actual psychologist only has 6 strands Hair, so contradictory (method of proof by contradiction).
Secondly, it was mentioned at the beginning that there is only one way to enter and leave the town, and the psychologist lives outside the town. It can be proved from the beginning that he drove into the town from the outside, so this can also rule out him as the murderer.
Secondly, the doctor couldn't commit a crime because of a heart attack. Of course, his revisit in the end might pave the way for him to commit a crime again.
Then again, the film’s constant mention of "Supermarket Bombings" is also foreshadowing the film’s satirical "media, lawyers" theme. If the pure doctor is the murderer, then the theme of the film is too thin, and the doctor is more of a suspenseful ending. effect.
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