I feel it too. Especially with that little memory flash a few chapters ago when Dan (I think) remembered the good and fun moments with Jaekyung... Like, there were no such moments shown in the main storyline so the flashback felt simply fake and unreal. It could've had more potential, unfortunately it's lacking 〜 ̄△ ̄)〜
I think what's happening here is Dan is too overwhelmed with everything. With his grandma in hospice, he knew she'll be gone soon. All the things he endured all this time to make the ends meet and provide for his granny felt lacking as there's no he can do with her situation. Her granny raised him despite old age and now that she's sick but he can't do anything is like a slap of reality to Dan that he's just a burden to other, one that can't do anything right. It's more than just about Jaekyung. Tho, the chapters didn't really reflect that well
I’m not an expert but if I recall correctly, abuse victims normally stay with their abuser because they still cling to their good memories and moments their abusers treated them decently (which is why they always go back to them when their abusers falsely promise they’ve changed). Dan’s brain is in a similar situation where he empathized with Jaekyung too much and only remembers him when he was being decent to him and not abusing him. That’s why he still thinks of Jaekyung and his heart misses him — cause his brain didn’t want to believe the abuse as part of Jaekyung’s character.
And I’m sure that having that weight on his shoulders is tough, but 95% of the manhwa is just dub-con/no-con smut say gex so it’s hard to really feel like KD is a real character outside of being a trope-y 2D. And despite being a victim, he’s this naive abuser-sympathizer, too. I forgot the term, but like there’s a real empathy deficit here because… this story ain’t that well written (imo)
I can’t feel any compassion for their storyline, like, at all. KD being all angsty and their situationship, fine. But this whole “I can’t live without you” ass arc is really a kick in the balls. It feels like one of those things where the author is telling you how a character feels rather than actually fleshing it out well.