before he died, seo-in's twin brother and his friends jumped yeongwoon(beat him up bad) and seo-in didn't know about it, because his parents made a deal to yeongwoon's parents(either gave money/covered yeongwoon's medical bills) and to privately move him so that it doesn't cause a scandal for seo-in because he was a rising model at that time. seo-in's parents didn't tell seo-in because they knew how attached he was to yeongwoon and how they thought it would affect his modeling career. that's why he was confused when yeongwoon disappeared out of the blue with no explanation

Can someone summarize for me please. I just read until ch26 and jump to ch65 than I understood only that the dead siblings is a bitch who ruins both of their life and died left only shit and shit, right? So I want to know the between because I am not tough enough to go though it.