I wonder what kind of mental illness sarang had.... All I can think of is sociopath or sum...

I mean she does have symptoms of a sociopath

My guess is it's a mix of ASPD and Autism, the symptoms align quite well with the behaviour she displays like the lack of guilt/embarrassment, her inability to view other people's perspectives and the far too forward bluntness

now im confused, i thought subin definetely more into sociopath and sarang into a pschothic behaviour.

but i agree with the other above me, sarang definetely has autism. the way she understand people in the direct way and taking it literally.