[1] The extended play was the unit's first major release to feature member Jaemin since their debut single "Chewing Gum" in August 2016; following his medical hiatus since early 2017.

[4] Originally debuted as a septet in August 2016 with the digital single "Chewing Gum", NCT Dream actively promoted as a sextet instead since February 1, 2017 due to member Jaemin's medical hiatus.

The label further stated that member Mark would "graduate" from the unit following the EP's release in December 2018, due to him turning 19 by the time, thus reaching the age of adulthood in South Korea.

The lead single "We Go Up" is described as a "retro vibe", urban hip hop track that saw the members singing about team spirit, containing "tinny" percussion and "booming" bass line along with the group "serv[ing] up swaggering raps and harmonious vocals".

[13] It was written by SM songwriter Kenzie and member Mark, whom went on to co-write three additional tracks in the album, while the former also worked with producer MZMC, singer-songwriter Bazzi, Mike Woods, and Kevin White on the song's production.