He has released numerous hit songs and is the president and founder of South Korean entertainment agency Dream Factory.

This commercial success was repeated in South Korea; his own company, Dream Factory, estimated that he has sold over 10 million records, including singles.

"Chakage Salja (Korean: 착하게 살자; lit, Let's Live a Good Life)" is a fund-raising concert which Lee hosts every year.

Lee supported protests calling for the impeachment of President Yoon Suk Yeol over his declaration of martial law in December 2024.

Lee has called members of the People Power Party “accomplices to rebellion” for boycotting the impeachment vote in the National Assembly on 7 December.