Nanjo is textbook avoidant, that much is obvious, but imo with Sunwha he tried hard to reach him after their falling out because he had to maintain his reputation, he's a ceo and businessman, saving face is his way of doing things, he might have also felt a sense of duty to Sunwha and thought he hadn't fulfilled his role. It doesn't matter if Sunwha used him because at the end of the day Nanjo is probably used to people using him for his money and that doesn't hurt him directly, so he wasn't disappointed by Sunwha as much as he was disappointed in Mok for directly hurting him by breaking his trust and revealing their affair without letting him deal with Sunwha first.
When Mok said he doesn't need anything from Nanjo he wasn't being truthful, he was lowering his expectations so he wouldn't be hurt if he was rejected again. But Nanjo could intuitively feel that wasn't really what Mok wanted and provoked him by kissing him and revealing how much Mok desired him.
Well you've got a point here.. but i hope nanjo isn't just doing for the sake of it and actually looking forward to build a relationship with him and also I wanna know nanjo's pov on what actually made him change his decision cause someway it still feels absurd and out of his character
i think nanjo is type of person who find relationship where he doesn't need attachment. like why he so hard reach out sunhwa despite he already know sunhwa only used him? and why when mokhyeog said he doesn't need anything from him he start agree to be close with mokyeong?