 His first world sprint championship, in 2007, was his first International Championships medal after a 13-year top-level career.As well as his success in the World Sprint Championships, Lee has fourteen wins in individual World Cup races, a gold medal, two silver and one bronze from the World Single Distance Championships and four gold medals from the Asian Winter Games as well as numerous South Korean titles, including 10 successive National Sprint Speed Skating Championships (2001–2010).He has set two world records during his career.