Responses
I think it’s more likely to be borderline, but these two are very similiar so I might be wrong, nevertheless his symptoms are the same as BPD, eg. impulsive behavior, explosive anger, extreme emotional swings and so...
Here’s a plausible idea, maybe his dad said being gay is a disease which made seungho feel bad about himself and he became depressed (some of you guys said bipolar as well and I can see that too?).