[5] To promote the first part of the album, "Make A Wish" and "From Home" were released respectively as the first and second single, under the name of NCT U.

The group promoted the album through music show performances and their own reality television series, NCT World 2.0.

"[16] The NCT U unit for "Make A Wish (Birthday Song)" consisted of Taeyong, Doyoung, Jaehyun, Lucas, Xiaojun, Jaemin, and Shotaro.

[17] The hip-hop dance track "Make A Wish (Birthday Song)" was co-written by rappers Penomeco and Damian, while music was composed by Sonny J Mason, Karen Poole, and Bobii Lewis.

[18] Korean and English versions of the song were included in the album, with Jaehyun explaining that these were recorded with international audiences in mind.

"[15] "Déjà Vu" is about the original seven Dream members reuniting, with Jaemin sharing, "The theme of the song was, 'Let’s go back on stage together.'

Describing the recording process, Xiaojun explained that they "wanted to use that feeling — like bad boys with this very special juice.

"[15] Instrumental "Interlude: Past to Present" was a favorite of some members, with Taeyong elaborating, "It explains NCT and kind of introduces the group within the music.

[15][19][11] The lead single of part 2, "90's Love", is a new retro hip hop R&B song featuring Ten, Winwin, Mark, Jeno, Haechan, Yangyang, and Sungchan;[20] its lyrics are about creating new and unique values.

"Work It" is an electronic dance song recorded by Johnny, Yuta, Ten, Jungwoo, Hendery, Jaemin, and Jisung while "Raise The Roof", sung by Taeil, Yuta, Johnny, Kun, Jungwoo, Hendery, Renjun, Chenle, and Jisung, is a hip hop track that uses oriental instrumentations.

"All About You", sung by Jaehyun, Jungwoo, Mark, Hendery, Shotaro, Sungchan, and Chenle, is a medium-tempo pop song that utilizes retro and modern bass sounds while "I.O.U" is a lo-fi hip hop track recorded by Taeyong, Kun, Doyoung, Yangyang, Shotaro, Chenle, Jisung.