Lee improved her national record in 2010, running a time of 13.12 seconds at the Colorful Daegu Pre-Championships Meeting in May.[4] Further progress came at that year's national championships, which she won in a new best of 13 seconds exactly.[6] Her season peaked at the 2010 Asian Games where she pipped Natalya Ivoninskaya, a Kazakh Olympian, to the gold medal in the final and became the first Korean to win the hurdles title at the games.[7]