If I had a degree in the way the brain works (see don't even know what's called) there wou...

Psych, man, it's callled psychology: study of the mind and behavioral, why we do what we do and such.

You don't need a psychology degree to understand what's going on. It could help you understand it better but looking at a reputable site on google can help too.

To understand the phenomena where a captive sympathizes with their captor look up "Stockholm syndrome" (not saying I agree or disagree with this but if you believe it's happening look it up to understand)
It will also help to look up information on abusive relationships and "trauma bonding"
To understand the phenomena where an abductor sympathizes with their hostage, essentially the inverse of stockholm syndrome, look up "Lima syndrome" (again not saying I agree/disagree with this viewpoint)
To understand how Bum behaves mentally look up "borderline personality disorder"
To understand how Sangwoo behaves mentally look up "antisocial personality disorder"

The last two will help you understand the mental illnesses of the characters but not necessarily the reasons behind their actions. Only Koogi has the answers to that and we can only speculate until we are given those answers.

Yeah I remember now thanks and I do know what's going on I'm not just sitting and thinking "oh what pretty pictures". I'll give you guys an example. Ok do you know Winnie the Pooh? Well people say that some of them (if not all have) have a mental illness. Thinking of the show that way did change the way I viewed it. Even though I know it's about a cute bear going on adventures with his friends.
Thanks for only noticing the stuff to make me look idiotic this conversation has been enlightening. (︶︿︶)＝凸