Evidence, there are three plots in the film that suggest this:
1. Shortly at the beginning, the male lead is captured and dragged away by a monster, but then he is played to talk to the male second captain. If the monster really exists, it has already eaten him.
2. The beginning is not too long. Male number one shoots a monster. But did not hit the monster, but saw something like a mirror
3. In the end, the protagonist shoots the infiltrating monster, but finds that it is a wire.
This is the biggest twist of the film.
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