
Let’s be real y’all. The blonde guy didn’t deserve to die. It’s the fact that he told ah-in to tell his mom about him, and his mom searching and hanging up posters for him really broke my heart. She won’t see her son because he’s already dead and his body is dumped in god knows where. RIP my man

I was re-reading this recently, and noticed he actually told him to tell his mom "he's sorry". A little later, Seo Ilmo mentioned everyone having "a side that they're careful to keep hidden". Now, this might of course just as well be nothing.
But I've been wondering for a while now about what the killer's motives may be, or if he might have some pattern we don't know about yet. Again, this may very well be nothing, but I also wouldn't be entirely surprised if there was more to that blonde than what we know just yet.
I just feel like something like that would fit with the style of the story, which seems to be only hinting and occasionally even initially misleading the reader, before fully revealing what's actually happening.

Oh, I wasn't really talking about justification at all (though to me personally, it does make a difference on whether or not I ultimately feel sorry for a fictional character as a reader) - I'm absolutely not about to dig up the "Kira question" and get into any kind of actual serious debate on such a grave matter for a fictional story like this one way or another - I just don't take it seriously enough for that in general (I honestly couldn't read or watch *any* crime fiction if I did ╮( ̄▽ ̄)╭)
Only about motives and the background of the characters. I'd just been wondering since the beginning if the killer maybe had a pattern of some sort (even just something as odd and random as Lecter killing "rude" people, for instance). And I felt after this chapter like it may possibly be something along the lines of people who have used and / or betrayed others in some way he considers unacceptable or something like that. Or not. It's just one of many possibilities. Like you said, there's no way to know for now, we'll have to wait to find out. I'm just speculating and wondering because I find it interesting :)
OMG THIS IS SO EXCITING