"But it wasn't always bad." The way he feels guilty when remembering the good times but they should've never hurt him like that in the first place. Just because they are family doesn't mean someone should put up with their crap, everyone has their limit.
Yes, that’s what I was thinking when that chapter came out. Eunyung probably is thinking of the very few good times with his family even though they were horrible to him. And it leaves him with guilt.
"But it wasn't always bad." The way he feels guilty when remembering the good times but they should've never hurt him like that in the first place. Just because they are family doesn't mean someone should put up with their crap, everyone has their limit.