Well, only by facing up to your own uniqueness can you live in harmony with yourself.
The little boy in the movie finally knows that the ghost has something to say to him, so he starts to help others bravely.
The psychotherapist's not-so-terrifying death imprint and patient companionship unraveled his psychological defense line, gradually allowing the little boy to embark on the path of facing up to his uniqueness, and finally gained the understanding of his dearest mother. A psychotherapist is medicine in itself, and if he wasn't a ghost, the little boy wouldn't be saved.
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