Haha! yeah, I think you're right. maybe when MD was talking about the kid at the counter, he was actually referring to DG's friend. xD I also understand zero korean, but from the last panel of chap25, that's what i'm also getting. Alex was jealous but he didn't have to be because MD was targeting the friend, hence his picture at the end. haha
LINK! xD
https://toonkor.com/BJ_알렉스_25화.html
OMG I THOUGHT THE SAME THING, BC WHEN DG FRIEND SAID THAT HE LIKED BDSM, I WAS LIKE HMM I SHIP THEM

I stg MD is after DG’s friend. He wouldn’t be in the frame if he was irrelevant.
*SPOILER*
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Bitch I just read 25 and I don’t understand a thing but I think I was right?? HAHAHAH