After reading it, I think the chief of the police may be a murderer. When he said that the protagonist did not know that he might have caused the murderer to cut her head, and then the girl’s head was actually cut off. The phone call may be just a cover, in advance. After the recording, the chief of the police is obviously at odds with the girl's father, so he is the most likely among these people. Why is the teacher not a murderer? The biggest reason is that the first three children hide and seek. One is hiding in the cabinet and the other in the cement pipe. The little boy easily finds the girl in the cement pipe. Why is the teacher suspicious? Because he has been paying attention outside, he may have seen another child come out, so he dismissed the idea, and pointed out the position of the girl to the boy. In the end, the teacher really gave his daughter medicine, because it can be seen that there is a rabbit doll on the ground. And the rabbit doll is exactly the same as the one held by the teacher's daughter on her birthday. What happened to the protagonist's daughter in the end is so hard to see, and we didn't even appear in the end when we saw it.
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