What is going on?

It doesn't have an exact setting. Hopefully, you'll like it. It's a Marvel AU. The main character will be said in the story. The time is going to be really after Endgame but Tony and everyone else never died. They defeated Thanos and are now living happily. At least until someone comes to visit...
The only character that is mine is the main one. No one else. Don't give me the credit.