My younger cousin also had very severe ADHD

When they were young, it was so severe that
they used to bully classmates a lot in elementary school,
spit in teachers' faces,
run around the hallways during class,
and cause trouble at school every single day.
Because of that, they were constantly suspended
and transferred to different schools several times.
They even moved to a rural village in Gangwon Province;
my aunt moved several times
just to find a school that would accept them.
They also received consistent hospital treatment.
But things improved drastically starting from middle school.
On the surface, they became normal,
did well in school, made friends easily,
dated, and lived a perfectly fine life.
(They are tall and handsome)
They are 29 now, got a job in a technical field early,
earns a high salary, and lives well.
They said they stopped taking medication in adulthood.
They were exempted from military service.
However, they are still slightly different.
Should I say their emotional range is thin?
They don't quite understand others' emotions.
It's not that they are selfish or anything,
but it seems they didn't learn social norms through intuition,
but rather through learning them.
Anyway, they grew up to be a solid member of society.