Responses
That's probably it
I'm pretty sure that's it. MD confirmed that even when pushed past his limit, Chanwoo won't say the safe word. That puts all of their past sessions into question. What if MD had been making Chanwoo uncomfortable, he'd be no better than Chanwoo's abusive boyfriends. Even if MD didn't have feelings for Chanwoo, there can be no good outcome from this type of relationship if one partner can't keep his part of the deal.
Yesssss
I think MD was trying to push chanwoo to his limit to say the safeword but chanwoo is stubborn to say it even after MD chocking him ( i think chanwoo is like that because he is too used to toxic relationships) ... MD realised that so he said the safe word. And bdsm based on deap trust between both ends and failing any of them to say the safeword is a huge deal that can easily destroy the trust...thats why he didn't contact chanwoo for sometime now. That is a theory!!!!!!!