During the six-day trip, Charlie gradually became acquainted with his brother Raymond, and also learned that Rain Man is Raymond, and Raymond is Rain Man. The person who had been taking care of him when he was a child, his father, in order to prevent Raymond from hurting Charlie, put the Raymond sent out the house. Charlie's hatred and resentment disappeared, his feelings for his brother grew stronger, and at the same time, he gave up the idea of competing with Raymond for the three million inheritance. Susannah is finally reconciled with Charlie.
The most interesting thing is that when Raymond tells the secret in the elevator, Charlie's attitude is very calm, there is no mood swing at all, maybe only American people. If I were Chinese, I'm afraid I would have to question Susannah. Such a setting can better portray the trust between brothers and lovers.
Anyway, I love Susannah in the movie.
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