The plot was simple and sweet. I read the manhwa before starting the show and noticed that there were many changes, some worked in the show's favour while some did not.
I liked the OST lot. It suited the show's atmosphere. The leads did a decent job considering it was their first acting project. However, I didn't really feel their chemistry. I have this nagging feeling that the show had a lot of wasted potential. Their relationship should've been explored a little more. Also, some scenes didn't seem appropriate to me. For starters, Dayeol left the school suddenly. As a manhwa reader, I know that's because he was on a scholarship and according to the rules he had to leave but for the show-watchers, it must've been a bit confusing. Also, the conversations they had while they went on the trip in the last episode were uncanny for a pair that's been together for two years. Some plot points seemed unnecessary and overdone, for example, the girl liking Dayeol and the friend who was an aggressive bully towards Dayeol.
Another thing is that the confrontation that Taehyun has with his aunt, it's supposed to be after Dayeol's confession. Here, the confrontation is before the confession so the order of events doesn't correlate well with Taehyun's state of mind and actions. Anyhow, as I mentioned before, the show had potential but it didn't utilize it well.

I don't mind the absence of NC scenes but a kiss or at least an indication of a kiss would have been a nice culmination to the show similar to say, Cherry Magic.