Busan Foreign School | The American International School of Busan, Busan Foreign School (BFS) is an international school (Prek-12th grade) with an American style educational philosophy and curriculum located in Busan, South Korea. Our mission is to inspire each learner by providing educational services that nurture their social, intellectual, emotional, and physical growth. Our students are prepared to enter top-tier universities worldwide as responsible citizens in a rapidly changing world. BFS has been fully WASC accredited since 1998. Busan Foreign School is.