In fact, as long as the male protagonist who has traveled back fails to defuse the bomb at the end, and the female protagonist is discovered by the murderer who disembarked and killed in the same way as the first time, then the body of the male protagonist who has traveled back is the male protagonist who has not crossed over and just arrived at the dock. Hearing the corpse with the same ringtone as his own cell phone, all the logic is fulfilled. The male protagonist just travels back indefinitely but is finally killed on the boat. This way the ending is not conventional, and there is no need to express infinitely like the film. The parallel universe, but the expression is not clear and full of loopholes
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