I thought about it carefully for a while.
I just finished watching it, in 2021, it is not surprising for split personality, so I can guess one or two of the previous plots.
At the end, I thought about it several times, but I still tend to think that the male protagonist is a lunatic: he believes that his group is still there, and he firmly believes. Then thinking about it in reverse, it can be understood as: what the female police officer is thinking about is that there are indeed those three people in the boy's mind.
Another thing that made me firmly inferred is the contrast of the lover in my dreams. Every time it appears, it is too embarrassing. They all appear suddenly under emotions such as excitement, tension, and confusion: she is a person who comforts and praises.
Five people equal him one: sociable, upright, jovial, feminine. It seems that the camera has brought the portraits of multiple personalities to the hospital more than once. Doctors don't lie.
So it's still a logical crime rate, but unfortunately I saw it too late.
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