A right-handed player from Seoul, Choi began playing tennis at the age of 10.

She won her first ITF tournament at Bangkok in 1993 and began touring professionally after graduating from high school in 1994.

[1] At the 1996 Summer Olympics in Atlanta she made the second round of the singles competition, with a win over South Africa's Joannette Kruger, before she was eliminated by 11th seed Brenda Schultz-McCarthy of the Netherlands.

[2] Choi represented the South Korea Fed Cup team in a total of 16 ties.

She won the women's doubles gold medal at the 2002 Asian Games and was also a bronze medalist in the team competition.