THIS!!! i want to make out with u sloppy bro thank you so much for saying this because i was about to write a giant paragraph like this. it’s actually annoying on how they’re completely ignoring the fact that this guy is a full grown adult. Any person in their right mind would be scared and want to run away in times like this and honestly Seju is a good guy for feeling guilty. If he had no problem then it would completely ruin his character. I think it’s good that the author is bringing this into light because so many authors are just like “kyaaaa forbidden love!!! the older guy feels no guilt!!! kyaaa so cute!! ^_^” and it’s amazing that we get to see the negative sides of this.
PREAAAAACH that's just common sense. I like he's character even more after this chapter. Even though he has fallen into a dark place after the death of his sister while degrading his humanity by commiting crimes, he still has his values at core so you can genuinely feel his pain and confusion. In this household we truly love complex characters.

Seju is an adult men, has been for like 10 years, and Sejin is barely 20...
Seju is having a real hard time accepting he's falling for a boy that's fresh blood, just barely legal, and even more conflictive, Seju raised this guy for over a year, so if you guys can't understand why Seju is so adamant to run away and not accept what he feels, then you've got some twisted minds... No adult should fall in love with people they raised, even if it was for a year... But Seju is aware of Sejin's feelings, and he's aware that he's falling too, and it all combined makes him run away... And to me it all makes sense... I don't know why everyone's so mad in here