Now, I knew "Yellow Door" was a documentary, centered on Korean cinema and with Bong Joon Ho, but I didn't know much else before starting to watch this movie. And I have to say that it is a very fulfilling experience to discover this group of Korean university students (back then, in the 90s) discovering art, cinema, and trying to be a part of something. It is an intelligent and delightful look to a love (movies/cinema) that brought many different people together and was the starting point for a very famous director.
There are too many people talking all the time, many of them (well, almost all but the actors and Bong Joon Ho) you will probably have never heard of before, and it is all seen through maybe too rose-tinted glasses, and sometimes their talk of Godard or similar (even if kept to a minimum) could feel a little pedantic, but this is a well worth watch (and not very long, as it is barely one hour twenty minutes). Give it a chance if you want to see how art, artists, dreams, communities are created and disappear.