I personally think that there are actually no demons in this movie. I'm not sure if my sister has any mental problems. My brother should have some mental illnesses. It was confirmed when he came out of the mental hospital at the beginning. At the beginning, he had that dream. The two brothers and sisters must have been childhood events, which caused a great psychological shadow on the sister and brother. The sister and brother were unwilling to accept the fact that the father killed the mother and the younger brother killed the father, thus putting everything away. The reason is all down to the mirror! If you look closely, it was the first time that my sister saw that the woman in my father's study was a normal woman, and the reason why my brother didn't believe it was a mirror at first was because he had received some treatment in a mental hospital and was finally arrested. He kept saying that it was a mirror, a mirror, which should have been formed in his subconscious. The demons that appear in the camera should also be formed in the subconscious.
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