The green shirt boy's mother didn't love him, his childhood was gray, and his speech and thinking were incoherent like a mental retardation. Except that his father was not mentioned in childhood, he should have died young. He has a younger brother, who should be very young. He is the second generation of a failure in her mother's eyes, and was killed by his mother intentionally or not. He was devastated, killed his mother, and fled on the train with his childhood toys (passed on to his younger brother). He thought that the gunfight in the movie was the reality, standing up and fighting back with two guns, the protagonist's halo couldn't save the mentally retarded. Only the widowed man saw his lonely childlike side.
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