Can someone tell me what the lore between them is?

Spoiler:











So basically Juyeon was severely bullied by Jiwook in highschool. Jiwook organized a gang rape and some other stuff happened( can't remember the other comments). Eventually some accident happened that caused Jiwook to forget these events, Juyeon comes looking for revenge then boom present story

Spolier















And apparently he sent the video of juyeon getting gangr*ped to his mom, hence why she's in the psychward rn

Naaaah what