at the Summer Olympics in women's and mixed doubles with partner Hwang Yu-mi and Kim Yong-hyun. Lee and Hwang had a bye in the first round and defeated Cheng Wen-Hsing and Chien Yu Chin of Chinese Taipei in the second. In the quarterfinals, Lee and Hwang lost to Zhao Tingting and Wei Yili of China 8–15, 15–6, 15–13. In the mixed doubles event, Lee and Kim were seeded three, but the pairs defeat by the Danish pair in the second round in the rubber game. In 2008, Lee won her first All England Open Championship title in women's doubles with partner Lee Kyung-won, beating Yang Wei and Zhang Jiewen in the semifinals and Du Jing and Yu Yang in the final. In August, she and Lee Yong-dae won mixed doubles gold medals in Beijing Olympics, beating Lilyana Natsir and Nova Widianto of Indonesia and also with Lee Kyung-won grabbed the silver medal in the women's doubles event. In 2009, Lee and Lee Yong-dae became world number one. They won three titles: Korea Open Super Series, Asian Badminton Championship, and China Open Super Series. They also played for Korea in Sudirman Cup in May. In the final, Korea lost to China 0-3. Lee and Lee were defeated by the Chinese pair, Zheng Bo and Yu Yang. In 2010, Lee competed in the 2010 Uber Cup as a member of the South Korean women's national team. There she led her team to its first Uber Cup trophy, winning all 4 doubles matches she competed in through the tourney. In the finals, she and her partner Kim Min-jung won against WR #1 Ma Jin and Wang Xiaoli, beating them 18–21, 21–12, 21–15. Although Lee and Kim were not regular partners and Lee Hyo-Jung stopped playing WD regularly in international games, Lee played exceptionally well, proving why she was the most successful player in the 2008 Olympics, winning both gold and silver medals. In June, Lee continued on playing women's doubles with Kim Min-jung, winning the Indonesia Open and the Chinese Taipei Grand Prix Gold, and finishing as a runner-up in the Singapore Open. While waiting for Lee Yong-dae to recover from his injury, she played mixed doubles with Shin Baek-cheol. In August, Lee partnered again with Lee Yong-dae in the Kumpoo Macau Open Badminton Championships, Chinese Taipei Grand Prix Gold, and World Championship, but their best finish was reaching the quarterfinals in the