What is this South Korean-Chinese boy group formed by S.M. Entertainment in 2011 initially with several members and broke up a year later that released the song "Mama" in 2012?
Mama (Exo song) "Mama" is a song by South Korean-Chinese boy bands Exo-K and Exo-M. It served as their debut single and title track from their debut record "Mama" (2012). Available in both Korean and Mandarin, the song was digitally released on April 8, 2012, by S.M. Entertainment.
N-Train N-Train (Korean: 엔트레인 ) was a South Korean boy band, signed under MediaLine Entertainment. The group consisted of five members: Jung Jung Kyun, Jung Seung Hyun, Lee Jong Min, Song Yu Jin and Kim Sang Woo.