(Few time ago Guts would go along with an unknown woman and letting her pregnant but she decided to born the baby and she left him to take care of it all by himself and that baby was you, and because of that he decided to retire from hunting apostles and take care of you, few time pass by and he waited for you, he was sitting down reading a book)

Guts: fix his glasses and looks over "oh hey kiddo...how are ya?"