umm

So like what I think that I have gotten fo far is that , sejin like seju ofc and seju knows , seju JUST killed a man who he knew pretty well and now he feels bad that he's become just like the thugs and sejin hates and he feels guilty that sejin likes him and thinks that he's not worth loving ,(hes just depressed) btw they were saying brother in the chapter right ,it's not brother it's his sister's revenge , I think it's a bit of a mistake with the translation, anyways yep

bless ur heart cause this made me understand better