SM Rookies is a pre-debut training team established in 2013 produced by South Korean agency, S.M. Entertainment. SM Rookies comprises young trainees who have yet to debut in a pop group or as a solo act.[1]The first batch of rookies debuted as members of the girl group Red Velvet in 2014. The second batch of rookies debuted as members of the boy group NCT which consisted of various subunits, its 1st subgroup NCT U, debuted in April 2016, its 2nd subgroup, NCT 127 in July 2016 and its 3rd subgroup, NCT Dream in August 2016.