I don't think that it's exactly Myungook doesn't feel secure. It's just simply because it's a good feeling if your beloved is jealous a bit. It feels like you are really the only one for him.
Okay... maybe I'm too sensitive but the little scene from the past with his dog really made my eyes teary.
Yes!! Such a huge and cute progression! I love this webtoon so much! It's like a BL fairy tale (with some darkness). I'm addicted.
Why?! She was an angel... And what's wrong with his "dad"?! He didn't show any symptoms of sadness. And he even hut his son, he is dead in my eyes.
I feel this unfinished! I want more.