The final boss is indeed a psychiatrist, but there is still a question.
Why did Sam kill the killer? I personally think it should be to protect the niece, because in the video it was the niece who pushed the four victims out. But I think it's the second niece who is protecting Nayana.
Why do you say that? First, a comparison. The eldest niece Naya covered her head in fear when the murderer went down to the basement. When the male protagonist's brother and sister-in-law went to find Naya, Naya was also very afraid to hide in the corner and did not dare to look back. So two details, one Naya dare not look at the murderer's face, the second Naya is very afraid of the murderer. In the middle of the movie, "Naya" looked at the murderer calmly in the car, without the slightest fear; in the mobile phone video of Ubaid (the framed school bus driver), "Naya" also calmly launched the victim The murderer, with a smile on his lips; at Lydica's house, the younger sister Nayana stood behind the little girl, and the movie shot seemed to express that Nayana wanted to push the little girl down... There are indications that the man following the murderer Not sister Naya, but sister Nayana. It was also mentioned in the film that the younger sister Nayana studied with the murderer, so the murderer could easily control Nayana.
Therefore, the murderer's revenge on Lydica was to kidnap the eldest daughter and never see the light of day, and cultivate the second daughter into a murderer. The male protagonist killed the murderer in the end to protect his niece, but not the eldest niece but the second niece.
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