Why is the autistic issue being discussed and why are people even fighting? Sangwoo isn't like everyone. It is very much clear and that is what makes his character more realistic. So does the author not saying it out loud. A lot of people go undiagnosed for years. If you didn’t notice it and thought he is a rando asocial introverted a.hole then read it from the beginning.
Is the artist of the mannwa and novel two different people? Usually it's two different people. If so, the artist's wrong deed affect the novelist too then? They were getting profit by selling their story as well. If it's the same person, how could someone who makes stories like this did that?
It depends on who has the copyright and what kind of contract they made with the artist and the writer. Maybe it's financially not worth to continue a project which is already tainted by these kind of allegations.