system
Given the following post, respond as if you're commenting on Reddit:
human
[Godfather] How did Michael know the story of Johnny Fontaine?

It seemed like Vito worked very hard to keep him in the dark of the family business especially the very gritty details like that story. How did Michael know it?
gpt
I suspect that the story was explicitly told to him so that he’d be averse to joining the family. His father later in the movie says he never wanted “this” (the mob life) for him, and maybe telling him the unsavory parts is a way of ensuring that.