'Yeon' is the spelling suggested by the government, but that system isn't always the easiest to read. English speakers, for example, have no point of reference for 'eo' and that is why non-Koreans have trouble pronouncing 'Seoul' and they either ignore the 'e' and say 'soul' or 'sole' or they pronounce it like an 'e' and say 'see-owl'. From the spelling, no English speaker would ever guess it was closest to 'suh-ool'. The spelling 'youn' is the one used not only by the BWF, but also by the
BKA, which often uses spellings that are unambiguous, if inconsistent. In Hwang's case, it just happens to be exactly one letter different from the name of 1992 gold medallist Hwang Hye Young, whose name in Korean also differs from the singles player's by only one phoneme. In other cases, the BKA's spelling differs from the government method, giving us Park Joo Bong rather than Bak Ju Bong, Kim Dong Moon instead of Gim Dong Mun, and Jung Jae Sung instead of Jeong Jae Seong.