Dean originally wanted to take Little Mike away, but Little Mike was unwilling. It wasn't because he couldn't bear to leave. It was just that Little Mike was very familiar with every blade of grass and tree in this place. He could navigate it with his eyes closed, making it convenient for him to wholeheartedly study and research synthetic hormones.
Seeing this, Dean didn't insist. He contacted a team to take care of Little Mike.
"This is the formula." Little Mike handed his most precious possession to Dean, saying, "Dean, there are few people who make me want to communicate. Come to see me when you can. If you could read more books, that would be even better. I've only talked about research with people online, but they aren't as straightforward as you; they like to try and find my location."