They are both highschoolers with zero experience with dating and relationships. At first, I didn't like the constant insecurities they keep dealing with, however once I completed the story I think it makes sense with a lot of first loves, especially for relationships that start in high school. I still remember high school classmates getting into relationship; they were hella messy.

Young-hyun learned to speak up more at home against his piece-of-sh*t older brother, while Dae-han got better at studying (even though he kinda overdid it in the story lmao)

I don't know if Young-han being a perpetual as*hole was for comedic effect, but I kept waiting for the part where he leaves the family for good or he passes away in an accident. If you remove the h*mophobia in the story, he is quite literally the Number 1 source of evil in Young-hyun's life. I'm just gonna headcanon in my head that he eventually leaves Young-hyun alone when Young-hyun goes to university with Dae-han.

the beach chapter where they argued about Dae-han going to a motel. I wish the misunderstanding and miscommunication was a bit shorter; it felt repetitive hearing the insecurities in Young-hyun's thoughts and seeing the immaturity in Dae-han's lack of communication. Again, these are highschoolers with zero experience in dating and relationships, but god that arc was a boring reading experience if you take out that factor.