There is a killer profession called looper, which specializes in killing people sent back from the future by future gangsters.
In the future, when the gang wants to terminate the contract and erase the criminal record, they will send the killer back to the past and let the past killer kill the future self.
In the present, the killer kills the future self and can enjoy life until 30 years later when he is caught and sent back to the past, and then killed by the past self.
2) There is another loop in the plot:
A kills himself who was sent back, retires to enjoy life, and meets the woman he likes.
It was not until 30 years later that A was to be captured by the gang and sent back to the past for execution, and his woman was brutally murdered.
The hated A escaped after being sent back, and wanted to kill the gangster B when he was a child, so as to prevent his woman from being killed in the future.
The future A then killed B's mother in revenge. From then on, B went down the evil road with psychological distortion, and became the boss of the gang after 30 years and sealed all loopers including A. A was to be captured by the gang and sent back to the past for execution, and his woman was brutally murdered. So a loop is formed.
When future A is about to kill B's mother, A discovers that this is a loop. Only by committing suicide can future A disappear, B's mother will not die, and B will not go astray.
So, A committed suicide.
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