Cika wannan jumla: Kim ya cancanci zuwa
Mata 400 m mutum medley a 2012 Summer Olympics a London, ta share wani FINA B-misali shigarwa lokaci na 4:46.56 daga Dong-A Swimming Championships 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.