Kim Jin-sun resigned as head of the organizing committee for the 2018 Pyeongchang Winter Olympics on Monday.
Kim had been in the post since November 2011.
"The committee is at a pivotal point for the latter half of its preparations, which require more detailed planning and execution," Kim said in a statement. "At this critical juncture, I believe that the committee needs new leadership and a stronger system that will effectively carry out the projects."
Kim was appointed president of the organizing committee in November 2011 after he played a key part in Korea's third and successful bid to host the Winter Games at the International Olympic Committee session in Durban, South Africa in July that year. His two-year term was extended in October last year until 2015.
There is speculation that Kim was forced out because of problems with the preparation process and the sloppy management.