Many friends are asking who is the murderer. I will tell you my opinion. At the end of the film, the psychiatrist returned home and went upstairs to visit a sleeping girl. I think this girl is the victim Anna Lu. In order to make money, the professor imitated the murderer of the six disappearances, kidnapped and told about Annalu's body at the bottom of the lake. The psychiatrist was precisely the murderer of the six disappearances, but he stopped doing it. During a fishing process, he caught Annalu, who was drowned at the bottom of the lake, happened to be alive, so the psychiatrist brought her back and imprisoned her. At the end of the film, the psychiatrist should have the heart to kill Annalu again, but after reading the previous six locks of hair and closing the box, he should not start. As for Annalu's life in the future, then we will not know.
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