After the trip Under

Once a boy had explored the whole underground and made them go free...but met a man who only spoke in...hands? This resulted with him landing in a whole new world or is it the same?

(This is based of the story of Undertale and Aftertale made by https://www.furaffinity.net/user/tehweenus/ . Also sorry if there is any mistakes, I'm still new at this. But please enjoy.)