He's the guy who never talk

Living in his own world.
Like normal person,
Like he can hear, nor can speak.
He's the guy who never talk.
He cannot say his own name, or his mother name.
He live in his own world.
Like normal person,
He doing thing exactly like normal person.
He smile when people smile.
He can even know how to make a joke.
He can even know how to make people proud of him.
He's the guy who never talk.
He can,t even hear when I called his name.
He watch television like normal people watch,
He watch music video like normal people do.
He like movie, He like cartoon.
I don't know why I wrote about him.
I just wonder, how do people like him living in this cruel life.
How do people like him survive in this  adventurous life.
Im just so proud knowing him.
because he is deaf and mute.
People say deaf and dumb. But for me, dumb is for people who cannot think, dumb is for the people who cannot do anything, so he's not dumb.
He just mute.
He is my workmate.
the one who never hear nor speak.