Responses
Jaewon who is crazy as hell, I just know he committed suicide on Seo-in apartment just so "Seo-In will be tormented forever" a person with that attitude will definitely want to die on their own terms rather than dying to their illness
he is so fucked up I assumed Jaewon actually killed his twin when they were still on the womb ╮( ̄▽ ̄)╭ and his terminal illness is revenge for what he did to his twin

Suicide or an accident?