jae's hate for dan's behaviors could be because he perceives 'not fighting' back as "weak". for dan's case, he fights misfortune in his own way, which includes no violence that he even ends up as a doctor.
similar backstories, yet:
- jae, to cope, closed his heart and turned out emotioneless
- dan, accepted hardships, as he is more emotionally wise but couldnt really find solutions to escape reality
the current jae aside, thats a harsh childhood i feel bad for the kid jae
may a love like this finds me and confines me till i die