I would say it's a bit overhyped. A lot of plot holes here and there (but what movie don't have those). It's a simple drama movie surrounding two families, rich and poor. Nevertheless I didn't expect to be hooked for the whole movie.
My expectation was very low and blinded by all those korean dramas cliche and kpop music everywhere before I watch the movie. If it weren't for the reviews everywhere I wouldn't want to watch it.
But surprisingly the overall execution was very good. And I did really genuinely enjoy the movie. Best of all it's fresh from all those Hollywood movies, in term of story, direction, basically everything.