Responses
Nah, Nk just realized he only wants sex with SH, bc having feelings is what got him heartbroken (IH), look at the hugging scene again. Also, the thought bubbles at the end belonged to Nk, not SH
Oh, I see
Either Nakyum is trying to forget the feelings he had with the teacher or he realized then that there was a difference between those two embraces.
Also, Yoon is definitely trying to convince himself that this is purely physical despite his actual actions. He said there was no need to share what's on their minds, but he questions Nakyum every time he can't read him. He's really screwing himself over while trying not to lol