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I previously found a movie here, but I can't find it anymore. The setting was a dark, rundown warehouse-like building. Inside, there was a large prison-style iron cage. A man and a woman were sitting on the floor inside the cage while another man watched them from outside. The man outside used psychological pressure and manipulation to control them. At first, the couple resisted, but later they became involved with each other. As the story progressed, they seemed to develop genuine feelings or attachment. Near the end of the film, the man who had been watching them walked outside, put a gun to his head, and committed suicide. I'm trying to identify this movie but haven't been able to find it.