The main point of the film is that the other self emerges from the mirror, kills the real person, and lives in his (her) place.
What's more ridiculous is that the heroine has always thought that her boyfriend is not a real boyfriend, and created the image of a victim. At the end of the film, the heroine is the substitute. This substitute is also in the play. The real person has been chasing after him to investigate the truth, but after knowing the truth, he calmly disposed of the corpse, still working and living as usual.
What I don't understand is that all four of them were killed, why did the younger brother not be killed alone? Could it be that he didn't look in the mirror? And why their family?
It is mentioned in the beginning and end of the film that the people whose hearts are on the right side, only later realized that what the mirror shows are all reversed, so the hearts of the people in the mirror are always on the right side. There are more and more people with hearts on the right side, which means more and more people in the mirror.
Maybe one day, you will meet the person in your mirror. Be safe.
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