The album was released on March 14, 2013, with the song "Expect" (기대해; Gidaehae) serving as the promotional track.

The song "Female President" (여자 대통령; Yeoja Daetongryeong), was used as the re-release's promotional track.

The album was initially slated for a February 2013 release,[2] however, it was delayed until March 14 for unknown reasons.

On March 5, 2013, it was reported that member Yura will be the female lead for the group's music video for "Expect".

Three months later, after the release on March 7, Dream Tea Entertainment announced that the group would come back on June 24 with a repackaged version of the album.

Expectation is composed of fourteen tracks: an intro, five new songs, five previously released singles, a remix and two instrumentals.

"Girl's Day World", the intro of the album, was written and produced by the group's leader So-jin, along with Kwon Seok-in, Choe Dok-wan and Cosmic Sound.

"I Don't Mind" was written by the members of the group along with Kang Jeon-myung, with production handled by Gregg Pagani and 1023Productions.

"Don't Forget Me" was released as the digital single album, Girl's Day Party #5, on October 26, 2012.

[18] The promotions of "Don't Forget Me" started on October 26, on KBS2's show Music Bank,[19] and ended on December 16, on SBS' Inkigayo.

[21] The promotions for "Expect" started on March 14, the same day as the album's release, on Mnet's music TV show M!