Its title song is "Nobody" ～あなたしか見えない～ (ノーバディ, Nōbadi), first released on their third Korean mini-album, The Wonder Years: Trilogy in 2008.

The EP consists of the Japanese version of "Nobody" as well as 2012 re-recordings of "Nobody" (in both Korean and English), "Saying I Love You", and "You're Out".

[1] After announcing the Wonder Girls as spokesmodels for the brand "Marshpuff" in Japan, JYPE requested that their Japanese record label, DefStar Records, listen to the Wonder Girls' released albums and singles before deciding on what song would be their debut in the country.

The label had strong mutual interest in "Nobody", so it was chosen as the title song for their first Japanese album.

JYP JYPE stated: "Wonder Girls have received numerous inquiries from Japan and [are] observing their advertisement and music business flourishing even without their official introduction."