see they’ve probably communicated in some way over the past obviously, but couples reach a point where they change (together, but in their own way) and if things they thought were set in stone are going south, talking it out would not be their first thought as they didnt have a problem with it in ten years.
thats literally what im saying it’s like you read what i said but you didnt understand im not sure, anyways “communication” is a big word, and in romantic relationships it depends on the situation, on a weak point. You can read at the beginning of the webtoon that the age gap is indeed one of these weak points, and that they do, in fact, communicate about it the best they can (given that the gap wasnt much of a bother before, as they explain too lol) but it happens to trip because there’s this thing called misunderstandings, which keep on snowballing and after all their problems get entangled, it’ll slowly start getting better as they learn ! A relationship is about growing and trying your best to understand the other ! (they do communicate btw just in a very broken way)

people when a manhwa whose in its description is centered around a couple struggling with there age gap is about a couple struggling with an age gap please dont be slow, sure its irritating to read at times but what did you expect the story to be about this is literally the entire point of the manhwa