The Best Picture Oscar nod to “Parasite” is a big deal. It’s the first time the award has gone to a film that isn’t in English. Marco Werman speaks with Hyun Jin-Cho, the film curator at the Korean Cultural Center UK, about where Bong Joon-ho sits in the continuum of South Korea cinema and how the tragicomic issues of class that pervade “Parasite” are something that the director has been interested in since he started making films two decades ago.