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What is the plot?
What is the ending?
Short version: The Lost Man escapes the corridor only after he chooses, at the end, to stop running from responsibility and go back toward the people he has been avoiding. The boy leaves the loop, and the Lost Man returns to the real world, where he immediately decides to go to his pregnant ex-girlfriend and faces the conflict he had been trying to escape.
He first becomes trapped after a train ride, where he sees an abusive man yelling at a mother and her crying baby, and then gets a call from his ex-girlfriend telling him she is pregnant and asking what they should do about the child. That pressure is what leads him into the endless corridor, where the hallway repeatedly tests whether he notices what is wrong and whether he keeps moving in the right way.
As he moves through the loop, the boy appears again and again, and the Lost Man starts protecting him instead of ignoring him. In the later part of the corridor, a flood comes through, and the Lost Man sacrifices his own safety to lift the boy up and keep him from being swept away. After that, the Lost Man reaches a stretch with no anomaly and continues forward until he reaches Exit 8 and leaves the loop.
The boy also gets out. The sources describe him as leaving Exit 8 and returning to his mother, though the ending leaves that return partly implied rather than shown in detail. The Lost Man reappears in the real subway station, buys water, drinks it, calls his ex-girlfriend, and tells her he is coming to the hospital and will be there for her. He then boards a train, sees the same kind of abuse again, begins crying, turns toward the scene, and moves to confront the man before the film cuts to black.
The main characters' fates at the end are: - The Lost Man: he escapes the corridor and chooses to face his responsibility as a father. - The Boy: he exits the loop and returns to his mother, at least as the film leaves it. - The pregnant ex-girlfriend: she remains in the real world, waiting for him, with the ending confirming that he intends to come to her and the hospital. - The abusive man on the train: the ending stops before the result is shown, but the Lost Man turns toward him to intervene.
Who dies?
No characters are explicitly shown dying in Exit 8, but the film strongly implies a death-like transformation and a near-drowning climax. The clearest answer is that the Lost Man does not die on screen, while the Boy is also not shown to die; both survive the final flood sequence and exit the looping corridor.
The important death-related moments are these:
- Walking Man: he is not shown to die in a normal, literal sense, but he is described as becoming an Anomaly after he leaves the Boy and walks toward "Exit 8," suggesting the space folds him into itself rather than killing him in a conventional way.
- Lost Man: during the flood climax, he is swept by rising water while trying to save the Boy, and one review describes him as "drowning" and sacrificing himself, but the film then shows him waking up in a different loop level and eventually escaping, so this is a false death / near-death rather than an actual confirmed death.
- Boy: he falls during the flood and is in danger, but the Lost Man hoists him up onto the overhead sign and keeps him above the water; the Boy then makes it out, so he does not die.
On the basis of the available sources, there is no confirmed human death in the film's main narrative, only disappearance, transformation into an anomaly, and a staged drowning that is reversed by the ending.