I may not have worked out all the plots either. You don't have to be too obsessed with the existence of tenants. My personal opinion is that all the tenant things only exist in the heroine's head. As for his appearance to find a new house in the end, it is just a symbolic meaning, a means of expression. The tenant represents the desire and the dark and violent side of everyone's heart. The tenant finds the new owner, which means that the dark side of this person has surfaced. A classmate said that this is an open ending, and I agree with it. There are a thousand Hamlets for a thousand people. Everyone has different opinions on the murderer in suspense films. This film is also considered a success. Haha~
I have seen another film "Identity" before, which is similar to this one, and it is also very good. If you like this movie, you can also watch it.
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