Kim Chang Wan is a South Korean rock singer, composer, musician, actor, TV host, radio DJ, writer, and poet. Kim, along with his younger brothers Kim Chang Hoon and Kim Chang Ik, began composing music during their mid-teens and formed the band "Mui" when they were college students.

After Kim graduated in 1975 from Seoul National University, they went professional and changed their band's name to Sanulrim (meaning "Mountain Echo"). The band's psychedelic rock/hard rock sound (reminiscent of the Sex Pistols) was music Koreans hadn't heard before, and Sanulrim revitalized the Korean music scene, which was currently devastated after several major musicians were arrested for marijuana possession in the 1970s.