
I'll side with Arthur. He purposely baited DC just to mock them. And even I, won't volunteered for that shitty sparring just to prove myself that I am a worthy DC member.
Like, if you think and observe closely, the way he delivered his introduction had so much backhanded meaning. It is either fight or flight response

Hell no. Of course, Joonho is lying. That guy has obsession tendency so why do he instantly said that he will not tell everyone. For Pete's sake, how many times do I need to hear that lie?
And Seungwoo, believe it or not, that's an advantage to him. He can use that info for blackmailing. If you still trust Joonho after what happen there. I don't know how to react. I don't. I--
Yeah. I don't really mind if you're naive, Sengwoo, but being dumb as hell. Gurl, I'm gonna whipped your ass. I'm too skeptical now because Joonho is sounding so suspicious right now.
May his soul and hole be rest in peaceful place