Many singles and albums have been released. Jae-Hwan Lee once sang OST for the TV series "The Love Name of Heirs", which is also a household name in South Korea. He also sang OST for many well-known TV dramas and appeared in the sitcom Room 24.

Jae-Hwan Lee, whose stage name is Ken, is a member of the Korean men's team VVIX. In 20 12, with the release of the album Superhero, she announced her official debut.