Jiyoon is kind of a refreshing protagonist. I think she's extremely likeable, and without relying on her being the "kindest," or the "smartest," or the "prettiest" or some other trait the author could shoehorn in. I dunno, it seems like she has a personality without having one forced upon here...
Kind of feel bad for him ngl, if you don't love someone anymore you should break up with them, like what else are you supposed to do?
Also this whole "I'm going to snitch on you to your mom for liking someone else" sounds kind of manipulative to me. Noa, you got to just pick up the leftover...
Aww it was sweet, but I felt like some plot.points could've been developed more. Having a inferiority complex due to parental favoritsm is a interesting thing, especially looking how it affects relationships! Ah well, it was cute at the end.