Also, these two pages right here: http://www.mangago.zone/read-manga/warehouse/uu/wareho...

Then this one:

http://www.mangago.zone/read-manga/warehouse/uu/warehouse-chapter-33/9/
http://www.mangago.zone/read-manga/warehouse/uu/warehouse-chapter-33/10/

The translation is: "Was it uncomfortable when I inserted it that time? Do you want to try it again? Come on, tell me bastard."

But I think Dohyun said, "Oh, did you not like it? Do you want me to pay you? You should have said so, you fucking asshole."

Just to add to this, what Dohyun means is that Sungho should have told him that he didn't like the sex. Dohyun truly liked Sungho and thought that they both enjoyed doing the friends-with-benefits thing it in the past.

not really, dohyun more or less stated ...if they wouldn´t have sex, to go back (to class)-at the beginning, when sungho showed he was very uncomfortable with it

Where is that? Anyway, in one of the previous chapters, Dohyun said touching Sungho gave him comfort and in chapter 33, he said that he liked Sungho in the past. I don't know why you try to argue what was clearly stated in the manhwa.

Yeah, and so that meant if they weren't gonna do it (the whole reason Dohyun went to a private place with Sungho), then they might as well go back to class. Dohyun wasn't looking for a chat or playing cards. He wanted sex. Sungho didn't. So, time to go back. How is that a big deal?

That was really an important message right there thanks for pointing out:D because both Chinese version missed that one too