Rubuta ci gaba don wannan sakin layi - Chang ta fara gasar Olympics, a matsayin 'yar wasan Koriya ta Kudu mafi ƙanƙanta (shekaru 14), a Wasannin Olympics na 2000 a Sydney. A can, ta kasa ci gaba zuwa wasan kusa da na karshe a kowane ɗayan wasanninta, ta gama na arba'in a tseren mita 100 (58.77), kuma na arba'in da ɗaya a tseren mita 50
(26.88) Ƙungiyar Ta kuma sanya goma sha bakwai, a matsayin memba na tawagar Koriya ta Kudu, a cikin 4 × 100 m medley relay (4: 16.93).