The English version was written by Star Wars (Galactika) and Sophia Pae.

[5] The Japanese version of "Loco" was released as digital single on December 1, 2021.

The English version was written by Star Wars (Galactika) with Sophia Pae.

[7] "Loco" was composed in the key of C-sharp major, with a tempo of 102 beats per minute.

[18] Prior to the album's release, on September 24, 2021, Itzy held a live event called "ITZY #OUTNOW COMEBACK SHOW" on Naver Now to introduce the album and communicate with their fans.

[27] At the 2022 MTV Video Music Awards, the song received a nomination for Best K-Pop.