So, what I'm getting is that he's starting to get jealous. He's not exactly the center of the universe for Seo. The little creep actually has a life that involves other singers. He literally has no right to be getting frustrated. Isn't this what you wanted? Probably got hooked on the constant attention and ego boost.
I read. I breathe. I eat. I inhale. I bleed. Black and Red Flag. Few green flags.