NCT 127 will be making their debut on this week's 'M! Countdown'!

On July 7, NCT's new unit group NCT 127 consists of a total of 7 members; Haechan, WINWIN, Taeyong, Mark, Taeil, Jaehyun, and Yuta. The boys will be performing their title song "Fire Truck" along with another track from their upcoming album "Once Again". Fans will also be able to listen to all the tracks of their 1st mini album with the release on July 10. 

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Make sure to check out NCT 127's debut stages!