they are so far away from a healthy relationship that the light from healthy relationship's sun would take approximately never to reach them. this story isn't, and never was about how sangwoo & bum can create the world's most fucked up relationship and then somehow have a nice and peachy romance in the end lol
it's nice to see people who want them to be able to find help and get better, but like i said, this isn't about happy endings. we've never seen this kind of story before, i would be very disappointing to see a vanilla ending after the ride we went through. also, there is no cure for psychopathy. no pill or therapy or vaccine can instill empathy xD
jaz is right. there are several treatments that exist, but no known cases of complete effectiveness/beneficiality. therapy is more likely to help in adolescence, and sangwoo is far past that point in his life. medications can only be used to treat symptoms, i.e antidepressants, mood stabilizers (for aggression and impulsive actions and the like), etc. whether a psychopaths behavior is willful or a result of their (unclassified) personality disorder is unknown (which is relatively frightening considering how unexplored it still is, and also the fact that there is evidence that claims psychopathy can stem from birth). charming. cunning. shallow. social parasites. unlikely to give much thought to the idea of punishment or treatment. sangwoo no less. i think the only thing that can cure him is his death.
i am not sure but i think the hole story will end up after they both are sent into some mental hospital and get help there and maybe return to be a normal civil (with observation) after some good years. i think this is the only solution cuz both of them need help only after they will get it they can maybe have some kind of a healthy relationship.