question: What nationality is Won Pyong-Oh's father?
context: Title: Won Pyong-oh
  Passage: Won Pyong-oh (born 1929) is a South Korean zoologist, known particularly for his work on Korean birds. He is the son of noted North Korean ornithologist Won Hong-gu (1888-1970). He has published approximately 120 papers on Korean ornithology. He has also published about 10 book-length studies of Korean zoology, although none have been translated into English.
  Title: Won Hong-gu
  Passage: Won Hong-gu or Won Hong Koo (8 April 1888 - 3 October 1970) was an ornithologist, professor and parliament member in the Democratic People's Republic of Korea (North Korea). He was the first to establish the names of local birds in the Korean language and to publish a major ornithological monograph for the region. He was also a specialist on small mammals. He was separated from his children during the liberation of Korea from Japanese rule and its separation. Unknown to him, due to the political barriers between South and North Korea, his son Won Pyong - oh also became an eminent ornithologist in South Korea. The two came to know of each other's existence after the war through a migrating starling that had been ringed by the son and recovered by the father.
answer: Korea
citations: Won Hong-gu Won Pyong-oh