Cause he actually can't use his brain. He is unable to.
ooh? is it well explained in the novel? I'M ONLY 1/4 WAY THERE and im lowkey pissed but entertained.
Yes, actually you will be able to see it the way he reacts to situation, the way he make decisions and the way he struggling to come with write words. It will be visible throughout the novel. Also they did mention that he has gone through lots of therapies and treatments but nothing helped. I think they did omit the part in the manhwa where they were showing that he only copies the words and expressions from the movies he had watch. He had teachers (the one who used to train actors) to train him how to evaluate and converse to be atleast a functional meber of society.
*right words
why's he so stupid, chase dumbness is bearable.. BUT FUCK, grayson is just something. if there's something that is beyond the word stupid, then it's grayson. use your brain not your dick pls ╥﹏╥