Rubuta ci gaba don wannan sakin layi - Kim ya cancanci shiga cikin 'yan mata 400 m na mutum
a Wasannin Olympics na bazara na 2012 a London, ta hanyar share lokacin shigarwa na FINA B na 4:46.56 daga Gasar Wasannin Dong-A a Ulsan. Ta yi nasara a zagaye na biyu da kusan dakika biyu a gaban wasu 'yan wasa bakwai, gami da tsohuwar gwarzuwar tagulla Sara Nordenstam ta Norway da Georgina Bardach ta Argentina, wacce ta lashe gasar Olympics sau hudu, ta karya nata na 4:43.99. Babban nasarar Kim bai isa ya ciyar da ita zuwa wasan karshe ba, yayin da ta sanya ta goma sha bakwai a cikin zafin farko. Tana shirin yin gasa a gasar Olympics ta Tokyo a shekarar 2020.