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NCT Dream is a subunit of the overarching group NCT, differentiated by other subunits with the unique concept of being all the members who were under 19 (21 Korean age) at the time of debut. Initially, members of Dream were supposed to "graduate" from the subunit and into other subunits as permanent members, but this system was later terminated and NCT Dream was made into a set unit. Debuting in 2016, NCT Dream now promotes as a 7-member unit permanently and are going on their first world tour as of 2023.