OK, Overall I loved this. Character, art, story. Brilliant. My one and only issue is the extra number 3. I understand it for plot purposes, I even think it's well written, shown as proper role play between two consenting adults, has an adorable reaction by poor innocent Hojun at the end, and they even explain the prep for it after the fact so that Hyung wasn't hurt.... BUT it was a rape fantasy. It gives me very mixed feelings, mainly because of how well written it was, and how it was showing them exploring different things they may or may not like. But, I'm never a fan of it. So if you're triggered by such things, you can skip it.
Saying all that, everything else in this series is amazing. And I can't wait to for Abyss to have more chapters, as I look forward to seeing how the author tackles darker subject matters.
The Good Teacher