"No matter what Ben and Isabella said, Sam refused to say a word except for calling them by their nicknames. Ben and Isabella tacitly set a new small goal: to make Sam talk more!

But regardless, Sam had already taken the first step. The three children played around in the private room, and Sam took out three iPads. Isabella taught Sam how to play games, while Ben wanted to teach Sam programming.

Sam was dragged around by them, but he didn't feel annoyed. On the ...