kwon at first said he didnt want to be involved with yoon, emotionally.. since they're just sex partners. So yoon is trying to keep their relationship on the physical level, hence clamming up and not telling kwon anything about him. Kwon got mad and said yoon should tell him still since it's kwon's decision whether he wants to accept those feelings from yoon or not (pretty asshole-y move because wtf, you're giving that person hope that he can depend on you but it depends on your mood whether you want to listen to him or not??). Basically kwon is a jerk and yoon should learn to work his healing on his own or even with his family because he wont be getting that from kwon and his hot and cold treatment towards yoon.
i dont know why yall in the comments r mad at kwon. the both of them agreed on this type of relationship. tho i do feel bad for yoon