
The miscommunication is frustrating, sure, but everyone seems to be forgetting these are college students and neither of them has been in a relationship before. The solution is obvious to us because we already know both sides but these guys are clueless relationship idiots, it's normal that they're not handling it well

Junseok has only ever been an fboy and he assumes that because he feels more deeply inside it must be obvious to others that he's sincere; Gunjoon feels inadequate and is too scared to ask for clarity. Those are pretty realistic mistakes to make especially in a first relationship -- that’s why a lot of them don't last!
I actually don't see this as a misunderstanding trope. Lyle is upset not just because Ash didn't tell him about a major formative relationship but also because Ash's friends all seem to think Hazel was a better match (and are being insanely rude about it). Honestly if you're partner's friend group is so openly expressing that it's normal to wonder if your partner knows they feel that way and is, at the very least, comfortable with it
*your not you're