Choi Kyung-sun gained her first international experience at the 2017 World Championships in London , for which she qualified with eighth place at the Daegu Marathon in April 2017. She reached the finish line after 2:45:46 h and was 54th . In 2018 she took part in the Asian Games in Jakarta for the first time, where she finished third in the marathon in 2:37:49 h after the subsequent disqualification of North Korean Kim Hye-song, who had arrived before her .
Personal best
5000 meters: 15: 52.51 min, July 6, 2019 in Chitose
10,000 meters: 32: 46.20 min, July 9, 2019 in Fukagawa
Half marathon: 1:08:35 h, February 2, 2020 in Marugame ( South Korean record )
Note: This article places the family name before the person's first name. This is the usual order in Korean. Choi is the family name here, Kyung-sun is the first name.