David the Miracle: '

Two years after his parents’ divorce, Harry’s mother admits to having a fling with her ex-husband…and she is pregnant. Already running a grocery store and taking care of his own family, Harry is forced to take in his mother and his new baby brother, David.

But by the time David turns seven, it becomes clear that he is intellectually disabled. David meets a woman, gets married, and starts a family, but he is not a normal person. He cannot stay at work for more than two days. David is a headache and embarrassment for Harry and his family—until he suddenly disappears.

Actually, David hitchhiked to Los Angeles, where he is miraculously cured.