Following the release of T-ara's and SeeYa's tracks for TWENTYth Urban, Cultwo has unleashed a new song - "Regret / ??". This song is part of the commemorative album for famous singer/songwriter Lee Kyung Sub's 20th anniversary. "Regret" was originally sung by veteran singer Jo Sung Mo, which received a lot of love when it was first released. Lee Kyung Sub remade the song to fit Cultwo's image and vocals. Check out the track below: http://www.youtube.com/watch?v=FCttby1geW4 Listen to the original: http://www.youtube.com/watch?v=qLQI59OzYeQ Other participating artists for the TWENTYth Urban album include Bae Da Hae, Davichi, and F.T. Island amongst many others. Don't forget to support Cultwo by purchasing their single! Source: Naver Music Picture: Melon