Wait...HOW does MD know Chanwoo?

It just suddenly occurred to me how weird it is that MD desires Chanwoo before we even saw them interact. How could he have known about him? One possibility is that word got around about Chanwoo's name and fetishes. After all, we DO know he's done BDSM play with other people before with his conversation with DG and confiding that he's met some creeps too). The more likely case is that DG just happened to mention Chanwoo while they were talking together, perhaps in the cafe? I feel like whether we like it or not, the author's going to give us a flashback of DG just mentioning Chanwoo to MD. I can just imagine their conversation going something like this:

MD: "So did you like the toys?"
DG: They were nice, but I'm not sure. I'm happy with the sex with Alex, blah blah blah"
MD: "So you mean he doesn't use them on you?"
DG: "Well, he did blindfold me and used them, but I got scared. It just isn't the same without seeing his face. After that, Alex stopped."
MD: "So you mean he doesn't do it anymore? What about you?" (MD possibly looking disappointed at the prospect of not being able to recruit DG)
DG: "I don't really like bondage and the whole BDSM play, it just doesn't appeal to me. I have a friend who is very interested in it though."
MD: (suddenly politely curious and interested) "Really?"
DG: "Oh yeah, he's is into that... type of stuff. He says he like the thrill of being at someone's mercy or being blindfolded. All that stuff."
MD: (now very interested) "This person...did you say he was your friend?"
DG: "Oh yeah, his name's Chanwoo. In fact, he... (glances rather obviously where an unsuspecting Chanwoo's working behind the counter as though unsure whether he should point him out).
MD: (following his gaze) "Is that him? So he's your co-worker?"
DG: "yeah, but he's not with anyone at the moment doing BDSM play tho".
MD: hmmm...do you think you can introduce me to him ( ° ʖ °) ?"

And now you know the rest. ╮(￣▽￣)╭