[1] SM founder Lee Soo-man continued as the release's executive producer, while several songwriters and producers, such as Ryan S. Jhun, Yoo Young-jin, Sonny J Mason, Deez, Moonshine, Cazzi Opeia, Benjamin Ingrosso, Livvi Franc, Louis Schoorl, Bobii Lewis, Jamil `Digi` Christmas, MZMC, and others, contributed both lyrics and production to the extended play.

Commercially, the extended play experienced success in South Korea; it became the unit's third chart-topper on the Gaon Album Chart, their first release to receive a Platinum certificate by KMCA, and subsequently the best-selling release by an NCT unit in 2019.

In conjunction to the EP's promotion, "Boom" was released as the lead single, to where it peaked at number ninety on the Gaon Digital Chart, while barely missing out the top ten on the Billboard World Digital Songs chart.

[4] The EP was released digitally on July 26, 2019, through several music portals, including MelOn, iTunes and Spotify.

The EP title song Boom was described as a piece of urban Hip hop, featuring "powerful verses - a bridge in the latter half of the song that features expressive back-to-back belts by Haechan and Renjun and leads into a warm-toned display by Jisung.