Dang, it was at the beginning so that makes sense. MC was trying to get him on his side by trying to "save him" from doing bad things (rape etc) for his brother, but every time, hongdae would say he did it because he wanted to or look confused. And he kept confessing that he wanted to abuse (literally beat his mf ass) the MC just as bad or worse than his big bro for pleasure (sorry if you actually didn't want a recap lol)

YALL I JUST READ THE RAWS I THINK HE RAPED EVERYONE IN THE NEW CELL THERES A FUCKING CLIP OF A BUNCH OF USED CONDOMS AND ALL THE CELL MATES NAKED WAIST DOWN AND SILVER HAIR FULLY CLOTHED WTF