Lee represented Korea at the 2004 Summer Olympics. She placed 2nd in the women's individual ranking round with a 72-arrow score of 675. In the first round of elimination, she faced 63rd-ranked Lamia Bahnasawy of Egypt. Lee defeated Bahnasawy 164-127 in the 18-arrow match to advance to the round of 32. In that round, she faced 34th-ranked Greek archer Elpida Romantzi, defeating her 166-146. Lee then defeated 15th-ranked Margarita Galinovskaya of Russia 165-163, advancing to the quarterfinals.
In the quarterfinals, Lee faced Wu Hui Ju of Chinese Taipei, narrowly defeating the 10th-ranked archer 104-103 in the 12-arrow match. Lee advanced to the semifinals, where she defeated Yuan Shu Chi, also of Chinese Taipei, 104-98. This moved Lee to the gold medal match, pitting her against fellow Korean Park Sung Hyun. In the final 12-arrow match, Lee lost by two points to the 1st-ranked Park, finishing with a silver medal in women's individual archery while Park won the gold medal.
Lee was also a member of the team that won the gold medal for Korea in the women's team archery competition.