This is the best interpretation in my mind.
"So the whole story is that the male protagonist is autistic, his parents died, and his grandmother/grandmother took care of him. In order to cheer up his grandson, his grandmother did a lot, and finally let him find his goal and become a cyclist. After being caught in the United States as a hard worker, my grandmother, of course, was desperate and left everything behind to find her grandson. In the end, she relied on the god-defying grandmother to save the male lead back to her hometown. After many years, her grandmother passed away, and the male lead's autism has long since recovered. At the beginning, my grandmother hoped that she could have a word with her, for example, after the movie was over, he didn't answer at that time, but now he answered it, and answered with his favorite grandmother."
(Appears at station b at about 74.54 minutes)
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