Yesss this actually one of my favorite topics fr Ok, so I think Nanjo likes to keep things in his control very above the surface but Mokyeon gets underneath that and has been since the first season like that ep where Mok is sucking his nipples and Nanjo is smoking the cigarette! I’ve always had this feeling that is the moment he started to give in fr! And right before that he threw Mok’s words right back in his face that whole “what u can’t get it up again” thing it’s because he pays close attention to everything Mok does with SunSun it’s different it’s very surface level I buy u this ,we text here and there, we meet up and fuck every now and again it’s simple nothing to serious so he can keep up this facade of being stoic and in control ,but with Mok that whole wall falls like imagine being a top and then finding out u like bottoming that shit prolly hurt his pride lmao but at the same time he’s enjoying it and now a whole new side of himself well at least new to us is showing and he can let loose with Mok but at the same time he doesn’t know what’s true and what’s not just like you mentioned before he thinks Mok is toying with him he constantly ask/says since season 1 things like “I don’t get you” or something of that nature but not derogatory it’s genuine because he can’t figure him out! Like how he was all shy giving him the banana piercing I think he started developing feelings way way before but couldn’t trust them because their foundation was rocky like his face when Mok sniffs him right before that shower scene or how he was biting his lip when Mok fell asleep on him Mok had already got beneath the surface and Nanjo prolly felt like he was being insincere and just wanted to be through with the whole thing

Chapter 17:
Nanjo: "If I'd give up on Sunhwa, would you back off too?"
Mok: "Don't worry. You won't be stuck with me for long. I get tired of things pretty fast".
------ That was not about protecting Sunhwa here-----
Nanjo starting to "like" Mok /have good feelings for Mok and Mok the id... he is telling him I am just toying with you. Going to throw you away later....-.-....yes