A regular volunteer of Habitat for Humanity since 2006, he was appointed its Goodwill Ambassador for Korea in 2008. Together with the Nippon Foundation and South Korean food franchise Genesis, Lee established the "Let's Tree Fund" in 2010 to conduct reforestation activities. In 2011, Lee joined relief efforts for victims of the Japanese earthquake and tsunami. Like many celebrities, Lee also publicly protested the forced repatriation of North Korean defectors.