An occasional theme in cinema is art imitating life, or vice versa. That was the gist of Francois Truffaut's "Day for Night", and it's the whole idea behind advertising.
I should note that "Bamui haebyun-eoseo honja" ("On the Beach at Night Alone" in English) is the first Hong Sang-soo movie that I've ever seen. I have some understanding of Korean cinema, thanks to "Parasite" and "Lady Vengeance". This movie is yet another comparison/contrast between life and art. Obviously I can't compare it to the rest of the director's work. What I can say is that it's a movie that tests your attention span: lots of long takes showing people just talking. I wouldn't say that it's exactly a good or bad movie, but I couldn't see what point it was trying to make. Or maybe it was an analysis of the protagonist's choices. Like I said, it requires a lot of concentration.
Whatever the case, it appears that Hong is an acquired taste, like Jim Jarmusch. See what you think.
