According to the content of the film, this should not be schizophrenia, but the phenomenon of doppelgänger. [The so-called double body is an illusory body that is exactly the same as myself in terms of appearance and memory. The double body will destroy the life of the main body, take away their most important things, and even kill the main body in the end. ] - Du Niang Encyclopedia. Also, the idea of doppelganger comes from the Japanese novel of the same name, and the Japanese songs that appear many times in the film are probably a hint, I guess.
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