Choi is the younger sister of Choi Yun-jung,[a] who also competed internationally for South Korea in swimming. The two were nicknamed the "Seal Sisters", and were noted frequently for both breaking national backstroke records at the same time.[5] Choi began learning to swim while in kindergarten through lessons at the YMCA.[6] Both sisters attended Seoul National University Middle School,[b] and represented their school in swimming at the national level.[7] Following the 1984 Olympics, she won gold in the 100 m and 200 m backstroke at the 1986 Asian Games.[8]
In 1987, she became the first South Korean model for the Japanese sports drink brand Pocari Sweat.[9] In 2017, she was named the first ever woman to become board member of the Korean Sport & Olympic Committee.[10][3]
^「물개 자매」또 한국신 [New national record again for 'Seal Sisters']. JoongAng Ilbo. 30 August 1982. Retrieved 5 December 2017.
^쌍두마차로 成長한「물개姉妹」崔允庭,崔允喜 자매 [Raised on a two-horse carriage: the 'Seal Sisters', Choi Yun-jung and Choi Yun-hui]. Kyunghyang Shinmun. 14 April 1982. p. 8. Retrieved 5 December 2017 – via Naver News.
^"전국수영폐막 韓國新8·大會新百46" [End of National Swimming Championships; eight new national records, 146 new competition records]. The Dong-A Ilbo. 22 July 1980. p. 8. Retrieved 5 December 2017 – via Naver News.
^"[파워브랜드] 동아오츠카 '포카리스웨트'" [(Power Brand) Asia Otsuka's 'Pocari Sweat']. Seoul Finance. 1 December 2017. Retrieved 5 December 2017.
^'亞 인어' 최윤희 전 수영 국가대표, 대한체육회 이사 선임 ['Mermaid of Asia' Choi Yun-hui, former national swimming champion, takes office as board member of Korean Sport & Olympic Committee]. STN Sports. 3 April 2017. Retrieved 5 December 2017.