Question: Yoo Ha, is a South Korean film director, screenwriter and a contemporary poet, he directed the critically acclaimed film,  "Once Upon a Time in High School" (2004), is a South Korean drama film, the background of the film is set in a high school in which country?
Sentence (from "Once Upon a Time in High School"): Once Upon a Time in High School: The Spirit of Jeet Kune Do (Korean: 말죽거리 잔혹사 ) is a 2004 South Korean drama film.
Relevant evidence: No