I always recommend T.K. Park’s “K-pop is Not a Genre” and the rebuttal “Is K-pop a genre? Yes. Yes it is.” by Lizzle from Beyond Hallyu to demonstrate the strangely difficult and elusive parameters with which we must define K-pop.
Not to toot my own horn, but I’d recommend my video as well. I don’t know of any other place in which the subject is discussed with that much length.