I haven’t seen Parasite yet but I have seen and admire most of Bong Joon-Ho’s other films. It’s success is bringing attention to other Korean films. I have seen others and will post comments on them later. Well Go USA is a company that releases a lot of Korean films in the US.
Films that were not release in the US are frequently available on eBay. I use film festival lists and sites like Eastern Kicks and Modern Korean Cinema to learn about the films.
Korean Film series in Baltimore last year
Korean Film list from BFI
Korean film list from the Houston Chronicle