A part of me thinks that perhaps NK didn't even get to hear the confession since SH had both of his ears blocked. It'd be incredibly frustrating if that was the case, but I wouldn't put it past Byeonduck.
If NK did end up hearing it, I think he'll simply believe Min's confused or that SH just likes him for his body or something similar. He won't suddenly be like "Oh, what really? Me too!". He mostly feels attraction for SH and perhaps just a spark of something more. He'll definitely feel conflicted, that's for sure.
I don't think Seungho himself is gonna process this very well haha!! But for Nakyum's part, if he heard what Min said, we can see the surprise on his face, the way he reacted when the lord put his face on his chest trying to protect him! I guess it's really the first time hes heard hes liked. I agree with @Verloren, he'll probably believe Min is confused or something like it. I really would like to see Nakyum tell Min that it isnt true, that he's just an object (I can see him saying that since he doesn't notice Seungho's feelings and he has such a low self esteem). After all, thats what hes thinking rn, isn't it? hmmmm
Ohhh i can actually see that happening
Ok everyone is talking about Seungho realizing his feelings but is anyone even curios about Nakyum's reaction will be? He'll be surprised obviously but what are his thoughts about it? This chapter is not only about Seungho having a development but also a straigt up confession lmao the author didn't really show if Nakyum actually has feelings for Seungho it could be that Nakyum still has feelings for his Teacher or is he finally over it? Im not only looking forward for Seungho's action on the next chapter but im also looking forward on Nakyum's reaction. LMAO any theories onNakyums part?