Whether the legendary story told by the two old people is true or false is up to the audience to judge for themselves. Personally, I believe more in the private detectives brought by the boy's mother, who were former robbers. But as the old man said, men should believe in some things in this life, such as love, courage, faith, etc., whether it is true or not.
Finally, at the scene of the accident, the Mr. Middle East who appeared, I would rather imagine him as the imagination of the boy (after his growth), only in this way can the legendary story made up by the two old men come to a real end.
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