I've seen everyone's comments, and the most mentioned is split personality, but it is obviously not. The heroine not only has auditory hallucinations and hallucinations, but even delusions that she is a stepmother, which is already a manifestation of schizophrenia. Split personality and schizophrenia are two different concepts.
The logic of the movie can stand up to scrutiny.
At the end of the movie, she walked straight out the door, because she quarreled with her stepmother and missed the chance to save her sister. It was because she fell into endless self-blame. In order to protect herself, the female protagonist who fell into the essence subconsciously erased this memory, transferred all the responsibility to her stepmother, and imagined that she had been torturing her sister. And she redeemed herself after completing her revenge against her stepmother, of course all this was her fantasy. When she went home, her stepmother was not at home at all.
When her father woke her up, the memory resurfaced and she was sent to the hospital again.
Kind people blame themselves endlessly because of their small mistakes, but the perpetrators have no guilt because they are just inaction.
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