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BEIJING, CHINA - AUGUST 22: Kukyoung Kim of Korea looks on after he competes in the Men's 100 metres heats during day one of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 22, 2015 in Beijing, China. (Photo by Christian Petersen/Getty Images for IAAF)

BEIJING, CHINA - AUGUST 22:  Kukyoung Kim of Korea looks on after he competes in the Men's 100 metres heats during day one of the 15th IAAF World Athletics Championships Beijing 2015 at Beijing National Stadium on August 22, 2015 in Beijing, China.  (Photo by Christian Petersen/Getty Images for IAAF)