It sucks because Dohu is just...autistic. like actually. He didn't really view it as using him for ulterior motives because he was very upfront about what he wanted from him (for him to be himself) and then the moment he realized their relationship had gotten deeper and that would be an invasion of privacy, he stopped. He knows retrospectively that it could be perceived as being two-faced from other people, and I think he's so used to being "abnormal" that he just accepts that what he does is going to be perceived however other people please and he's in the wrong...but if he explained himself properly and actually communicated how things played out and that he genuinely didn't know what he was doing was wrong + how he stopped the moment he heard it was bad, a lot of this would have been smoothed over.
I do think that would help but unfortunately wouldn't solve the root problem because Juheon's primary issue was that even when Dohu realized what he was doing was offensive and stopped, he never honestly admitted his actions. To Dohu, it was all water under the bridge and I can see why he thought that -- their feelings were now mutual and revealing his original true intentions would have soured their relationship. But to Juheon who really prioritizes transparency, his argument is that Dohu should have been honest the moment he realized his actions were wrong instead of trying to keep it hush.
I personally don't want that type of character development from Dohu, because Dohu has always been an empathetic character, like how he chose to stay with the little kid in the early chapter. The problem is Dohu is naturally slow at understanding certain things. He has attempted to understand others all his life, even going as far as to be a writer, but still couldn't due to his natural constitution. You simply can't ask the blind to suddenly see.
Dohu recognizes this, hence why he doesn't argue whenever people tell him he is the problem. I would hate if the story goes to prove that everything that goes wrong is automatically Dohu's fault, and that Dohu is doomed to never has anyone to accept him for who he is. For this relationship to work, it cannot be just Dohu's one sidedly try to solve. Juheon himself has a lot of growing to do.
Reading this, I can literally feel Juheon's irritation towards Dohu. While Dohu is a very likeable and interesting(not perfect which makes him better) MC, I do get why Juheon is irritated. His biggest fear is being used by someone who's two-faced(aunt, that sunbae in college, that other sunbae that gave answers, etc.). He falls for Dohu precisely bc he presents as someone abnormally honest and upfront, and per his words, liked Juheon for who he is and no other reason.
So to find out that the foundation of your relationship is built on exactly what you fear most(being used for dishonest purposes), by someone who you trusted, it not only ruins the trust you have in the other person, but also yourself. It would quite frankly, make a person mistrust their own judgment.
I can't really tell how this story is going to progress. If it's just Dohu convincing Juheon of his honest affections, it honestly would feel repetitive of season one. I actually feel like Dohu needs a redemption arc, bc while he is funny and upfront, he does have a tendency to push himself onto others in a way that's unwelcome.His character flaw is that he can be quite selfish which narratively, makes for great plot and character arcs. Personally, I hope we get to a point where he can learn to be a bit more empathetic, and where Juheon can learn to be more confrontational.