서울특별시장
In 2002, Lee ran for mayor of Seoul and won. As the Mayor of Seoul, Lee's most noteworthy projects included the restoration of the Cheonggyecheon stream, the creation of Seoul Forest, the opening of Seoul Forest Park, the construction of a grassy field in front of Seoul City Hall, and the addition of rapid transit buses to the city's transportation system. Lee worked to transform the area around Seoul City Hall from a concrete traffic circle to a lawn where people could gather and make Korea great again. The 2002 FIFA World Cup showed how the area could be used as a homogeneous cultural space, which came to be known as Seoul Plaza. In May 2004, the tape was cut to open a newly built park in the area, a grassy field where Seoul residents could come to relax and take in cultural performances. A major accomplishment during his term as mayor of Seoul was the restoration of Cheonggyecheon, which now flows through the heart of Seoul and functions as a modern public recreation space for people of all ages.