https://www.thrillist.com/entertainment/nation/bong-joon-ho-movies-ranked
There are few other South Korean directors beside Bong that are good starting point if someone wants to go deeper into South Korea cinema:
Ki-duk Kim: Spring, Summer, Fall, Winter... and Spring (2003), Pieta (2012), 3-Iron (2004), Address Unknown (2001)
Chan-wook Park:Oldboy, The Handmaiden (2016), Joint Security Area (2000), Thirst (2009)
Chang-dong Lee: Burning (2018)- for me the best Korean movie in the last few years, but unfortunately didn't even get Oscar nomination for foreign film, Oasis (2002), Peppermint Candy (1999), Secret Sunshine (2007)
Considering the fact that Tarantino said that he will (probably) make only 10 movies, and we are at number 9 at the moment (he doesn't count My Best Friend's Birthday), he might end up career without winning best picture Oscar, and join group of some great names like Hitchcock, Kubrick, Kurosawa, Leone, Welles, Fellini, Altman etc. I wouldn't thought so after watching Pulp Fiction back in 1994/1995, i was certain this guys wins an Oscar soon.