In addition, the scenes in the secret room were shot with a portable camera, and most of them used close-up and close-up, giving people a sense of closure, depression and suffocation. The flexible switching between objective perspective, subjective perspective, and monitor perspective naturally produced a "misleading" effect on the audience that the director deliberately made, making the audience keep guessing, but never knew who the murderer was. It can be said that the director played a big game for suspense.
As a thriller, vivid characterization allows the audience to resonate with the characters, experience the characters' experiences, and feel the characters' feelings. But perhaps because the director focused his energy on setting the suspense of the story, the portrayal of the characters was relatively weak. There are very few shots used to portray characters in the film, and the relationship between characters is even more ambiguous, which leads to the blurring of the film's main theme. The film seems to tell a truth about human nature, but in the end, the director did not let people understand what medicine he bought in the gourd. Character characterization is a very important part of a thriller, but it is the "broken foot" on the film's promotional poster.
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