"The 7th Sense" (Korean: 일곱 번째 감각; RR: Ilgop Beonjjae Gamgak) is the debut single by South Korean boy group NCT U, the first sub-unit of NCT.

The label's plan was to debut a new boy group with an "unlimited" number of members with their "culture contents" strategy.

They released a video called "SM_NCT#2 Synchronization of your dreams" where Taeyong, Hansol, Ten, Mark, and Jaehyun performed a dance, there was a song teaser vocal by Taeyong, Doyoung, Jaehyun, Mark, & Haechan.

In an interview, the composer said he was curious about the new idol group's debut with the song and that a foreign reaction would be good.

It contains NCT's desire and aspiration to communicate powerfully with the public in the future.