It's more brain-burning, and it seems that I don't understand it after reading it. But it's great, and I'll have to watch it again if I get a chance. After reading everyone's analysis, I will say something. If there were 6 victims 30 years ago, then the professor was imitating the crime. The lines mentioned copying many times, lack of money, etc. He really lacked money. Therefore, imitating the fog man and selecting victims with the same characteristics as the fog man's crime target, he wants to make everyone doubt himself, and finally let everyone think that the fog man committed the crime, in order to earn compensation. The way he achieved his goal was to use police detectives, deliberately leaving all kinds of evidence, and guiding the media through police detectives. But he made the mistake of drawing a circle on his hand. Killed by detectives. The psychiatrist is a fog man. He had already washed his hands 30 years ago because he had a heart attack while committing the crime. The sad detective was in a hurry to solve the case in the end, and he may have lost his mind. He could not tell whether the professor was a fog man or not, and whether the crime was a fog man or the professor. This is why he killed him after seeing the circle on the professor's hand. At the last moment, he said that the psychiatrist is a fisherman who only catches one type of fish. He may have also woken up and realized that he was being tricked, but it was too late. There is no way to recover.
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