The leader of the organizing committee for the
President Jin-sun Kim delivered his surprise announcement during an executive staff meeting at the committee's Seoul headquarters.
"PyeongChang 2018 is at a turning point for the latter half of its Games preparation, which requires more detailed planning and execution," he was quoted as saying in a news release.
His departure comes at a time of some turmoil. The committee is reportedly being audited by government officials and recently had its secretary-general leave, too.
Pyeongchang was selected over Munich, Germany, and Annecy, France, as a host city. South Korea has never before held a Winter Olympics.