Although he plays an autistic child, Yun Joon Suk, has said that he is not autistic. It would be difficult for someone with the level of the disease that Suk supposedly has to act in any capacity, so the actor had to take on the traits of someone who is autistic and make the disease his own. He has proven that he has great range, even as a young actor, because he can play a character who is disabled while knowing little of the syndrome personally. The fact that he plays an autistic character does not mean that he is autistic, but he plays the part well.
Is Walter Jr autistic in real life?
I can’t say I’ve seen his work, but many actors have been able to play the autistic character in film and TV and show that they are not really autistic. Personally I don’t know if this young man is autistic, but I believe what you say.