Career
She began competing in the longer road running events at a comparatively young age and was third in the Seoul Half Marathon in 2001 – her time of 1:17:51 was among the fastest by a junior that year. The following year she made her debut over the full distance at the Seoul International Marathon and secured third place with a time of 2:33:22. She earned a spot on the South Korean team for the 2002 Asian Games in Busan and ran a career best of 32:46.54 for the 10,000 metres, finishing in fifth place.
At the 2004 Athens Olympics, she finished in 23rd place, the second South of Korea past the line after her compatriot Lee Eun-jung.
She disappeared from the international athletics scene in 2004 and only re-emerged in 2008. She made her comeback at the Gyeongju International Marathon in October 2008 and was runner-up behind her national rival Yun Sun-suk.
Continuing her focus on the marathon she ran at the Seoul International Marathon and finished in sixth place. In March 2011 she was the first Korean home at the Seoul International Marathon, taking third place in a time of 2:32:25.
Chung represented her country on home turf at the 2011 World Championships in Athletics held in Daegu and placed 35th in the women"s marathon race.
At the 2012 Seoul International Marathon she was eighth and the second Korean finisher. She competed at the 2012 Summer Olympics and finished in 41st place in a time of 2:31:58.