<prompt> Bhala ukuqhubeka kwalesi sigaba - UChang wenza i-Olympic yakhe yokuqala, njengombhukudi omncane kunabo bonke eNingizimu Korea eneminyaka engu-14 ubudala, kuma-Olimpiki asehlobo ka-2000 eSydney. Lapho, wehluleka ukuqhubekela kuma-semifinals kunoma yimiphi imicimbi yakhe ngawodwana, waqeda endaweni yamashumi amane emjahweni wamahhala wamamitha ayi-100 58.77, kanye namashumi amane nanye emjahweni wamahhala wamamitha angama-50.  <response>: 26.88 Izindaba Ubuye wabeka indawo yeshumi nesikhombisa, njengelungu leqembu laseNingizimu Korea, emjahweni we-4 × 100 m medley relay 4:16.93. 