Kian is a patient with quite severe ADHD.

He doesn't have major issues with concentration or intelligence, but he is the type who struggles with prioritizing tasks and impulse control.
It's not psychopathy or borderline intelligence or anything like that; if anything, it's closer to the autism spectrum.
Looking at Kian, he finds it difficult to read or analyze social cues and is very self-centered with strong stubbornness or opinions, which is also one of the typical symptoms of ADHD.