Lee Hyo-jung (Hangul: 이효정, Hanja: 李孝貞; ; born 13 January 1981) is a South Korean former badminton player. She won the gold medal in badminton mixed doubles at the 2008 Summer Olympics with her partner, Lee Yong-dae. Lee Hyo-jung and Lee Yong-dae were unseeded, and in the finals they beat the top seeds and 2005 and 2007 world champions Lilyana Natsir and Nova Widianto of Indonesia, 21-11, 21-17. Lee Hyo-jung also won the silver medal in badminton women's doubles at the aforementioned Olympics with Lee Kyung-won; they were seeded fourth and lost to the second-seeded Chinese pair, Du Jing and Yu Yang. Lee became the first woman in Korean history to win gold medals at both the Olympics and the Asian Games. In the 2010 Asian Games, she partnered with Shin Baek-cheol instead of her usual partner, Lee Yong-dae. After winning the medal, she announced her retirement despite many pleas from her coaches and fans at home to continue playing until the London Olympics in 2012. Career In 1998, Lee who attended the Haksan Girls' High School won the girls' singles, doubles, and mixed doubles events at the German Junior tournament. She was competed at the World and Asian Junior Championships. At the World Junior, she partnered with Jun Woul-sik in the girls' doubles and Choi Min-ho in the mixed doubles, captured the bronze and silver medals respectively. She and Jun also won the silver medal at the Asian Junior. Lee junior competed in some international senior (level 4) tournament, and won double titles at the Korea and Sri Lanka International, also women's doubles title at the Hungarian, Australian and Norwegian International tournaments. In 2000, Lee won the Asian Championships in the women's doubles event with her partner Yim Kyung-jin. At the age of 19, Lee competed at the Sydney Olympics in the women's doubles with Yim and in the mixed doubles with Lee Dong-soo. She and Yim defeated in the second round, while with Lee Dong-soo defeated in the first round. In 2002, she finished as the runners-up at the Chinese Taipei and Singapore Open in the women's doubles event with Hwang Yu-mi. In 2003, she and Hwang also the runner-up at the Thailand and Chinese Taipei Open. In the mixed doubles event, Lee who was teamed-up with Kim Yong-hyun achieved their best result by winning the bronze medal at the Asian Championships. In 2004, Lee competed for Korea