On March 4, 2015, a representative from EXID's label spoke to Star News and said that the group was working on a new song, scheduled to be released in the second week of April, but that it was undecided if the song would be released as a single or with a mini-album. On April 3, the album's cover art and tracklist were leaked online, prompting Yedang to issue a message the following day, stating that they would take legal action if the leak harms the group's comeback success.
The group held a showcase at Noon Square in Myeongdong on April 12, during which they revealed "Ah Yeah" and performed the song for the public for the first time.
As of October 2015, the album has sold close to 41,000 copies in South Korea and 7,000 copies in Japan.
The album was composed by Shinsadong Tiger, who has been the group's producer since their debut. Member LE also participated in the album's production, co-writing and composing all the songs on the album. The title track, "Ah Yeah", is a hip-hop style dance song with a repetitive hook. "Pat Pat" is described as an "urban R&B" song and "With Out U" as an "urban dance" song. The album also includes their previous single "Up & Down" as well as a new version of "Every Night."
The first single made headlines for its belated chart run — after initial mediocre success, the song started charting three months after its debut. The late success of the single was attributed to a fan-cam video of member Hani performing the song, which went viral across Korean social media networks in late November.
^Kim, Hyeon-sik (November 25, 2014). 걸그룹 EXID, 기적의 차트 역주행으로 '대반전' [Girl Group EXID, Miraculous Chart Sprint "Shocking"] (in Korean). CBS/NoCut News. Retrieved November 28, 2014.
^Lee, Seung-mi (November 23, 2014). '제2의 빠빠빠'탄생?…EXID '위아래'광속 차트 역주행 [Birth of Second "Bar Bar Bar"? EXID "Up & Down" Has Light-Speed Chart Sprint] (in Korean). Ilgan Sports/Joongang Daily. Archived from the original on November 30, 2014. Retrieved November 28, 2014.