Kim graduated from Seoul National University in 1975 with a bachelor's degree in Agricultural Studies, major in Natural Fiber.

After Kim graduated in 1975, he and his brother went for professional career debut and changed their band's name to Sanulrim (산울림 meaning "Mountain Echo").

[6] In 2008, he founded the eponymous Kim Chang-wan Band, with himself on vocals, keyboardist Lee Sang-hoon, bassist Choi Won-sik, drummer Kang Yoon-gi and guitarist Yeom Min-yeol.

[17] He has appeared in supporting roles in film and television, notably in dramedy The Happy Funeral Director, omnibus Beating Heart, medical drama Behind the White Tower, and romantic comedies Coffee Prince, Queen of Housewives, and My Love from the Star.

[23][24][25] The versatile Kim has also starred in a stage play (A Nap in 2010), hosted variety shows and radio programs, and written several books (some containing poetry).