where did we saw him?
He made an appearance in the beginning of the story. I don't remember what chapter though lol.
Wait they're the same person?
If we are talking about the dude who was blowing wooyoung's brother then yes lol. I don't remember how exactly wooyoung knows him....I wanna say he knows how to gather info on people so wooyoung hired him to find out stuff on kyungjoo. I'm not sure if they were friends before that or he was just someone who wooyoung found. But ya I remember him because of the long hair which none of the other male characters have.
YESSS I WAS WAITING FOR LONG HAIRED DUDE TO COME BACK