American Comics: The Path of a Kingpin, Even the Avengers Call Him Godfather

After transmigrating into the Marvel Universe, he is forced to become a gang member. He thinks he will have to live as an ordinary person for the rest of his life, but then he unexpectedly obtains a Comeback System.

Except... the System seems to have arrived 16 years too early.

System: As a 36-year-old mid-level gang member, you have endured the Blip, betrayal, and imprisonment. You don't want to keep scraping by, so you're going to establish...

Lin En: System, I'm only 20 right now. None of those things you mentioned have happened yet!

System: ...Establish your own organization, and receive an immortal body as a reward!

Lin En: An immortal body? Hmm... If Kingpin can become the underground emperor of New York, why can't I, Lin En? I won't just become New York's underground emperor. I'll become king of the world!

Many years later.

Looking over his vast kingdom, Lin En sits on his throne and addresses the superheroes before him.