[2] "Electric Heart" features "soft, whispering vocals" laid over electronic beats and a guitar chorus.

Key named the song his favourite on the album, citing its difference from the band's existing work.

Minho wrote the raps to "Up & Down", "Obsession", "Your Name", and co-wrote the songs "Wowowow" with JQ and "Shout Out" with the fellow members and Misfit.

[3] "Ready or Not" was written and composed by Will Simms, a French music producer who made his debut in SM Entertainment with this song.

[5] A highlight medley containing snippets of the album tracks was also posted on Shinee's official website on July 15, showcasing the variety of genres.

[6] The album was released on July 19, and within hours, topped various physical and digital sales charts in South Korea.