Answer:
the Literal Meaning-
A boy grows up playing games with his father. One day, his father leaves (to jail). The boy didn't know why then, but he knows now. He wrote a letter to his father explaining that he has so much more to learn that hasn't been explained yet. The father writes back, saying that he is sorry, but can't be there for him, so he needs to be there for himself.
This is a story about relying on others, walking past that, and learning to be independent.
Hope this helps!