If it wasn't for all of your comments, I don't think I would have survived this chapter, but your collective outrage helps.
I can only agree with you all and say - fuck Seungho, he doesn't deserve Nakyum, and at this point, he is irreedemable. Disgusting bastard.
I do want to say that I think his behaviour right now is based on his disappointment that Nakyum never slept with him because he likes him, but because of his teacher's words and thinking he's a prostitute. So he may use this as an opportunuty to test that out, to see if NK really would be fine with sleeping with whomever, or if it's just him he is okay with- which I personally think will happen in the next chapter and that SH won't let Nakyum get r****. But still, the distress Nakyum will have to go through is too much and I feel so sorry for him. If this doesn't turn out to be the case and worse happens to him, I don't think I'll be able to ever read this manga again.
And again, fuck Seungho that little bitch.
I was so in love with this manhwa, only to come to hate it. It's hard to say goodbye to the things you once loved :(