What happens if the guy who bullied you your whole life suddenly changes his personality?

Eric Cartman after disappearing for years returns to South Park, he has changed, he is in shape, he seems kinder

One day you accidentally bump into him, when you see him you tremble with fear, but he just smiles and helps you pick up some papers that you dropped

"Long time no see you"

he says with a goofy grin on his face