"Day and Night (Love All)"
Released: September 8, 2012
Day by Day is the fourth mini album (though titled the sixth mini album) by South Korean girl group T-ara, which was released on July 3, 2012, by Core Contents Media. The album marked the first appearance of the group's eighth member, Areum and the last appearance of the group's member Hwayoung. A repackaged version of the album, titled Mirage (though titled the seventh mini album), was released on September 3, 2012. "Sexy Love" was released as the title track from the Mirage repackage.
On June 13, 2012, Core Contents Media announced that the group would be releasing a new EP entitled "Day By Day" on July 3. The mini-album was preceded by the release of the title track as its promotional single, along with a science-fiction themed music video that showcased both "Day By Day" and another track from the mini-album, titled "Don't Leave." Upon the song's release it quickly rose to number one on the Instiz charts, receiving an unofficial "all-kill" in the process. The Day By Day mini-album marked the debut of T-ara's eighth member, Areum, while the music video featured T-ara's sub-unit member Dani as an actress alongside current members Jiyeon and Hyomin. The second music video for "Sexy Love" featured member Eunjung and Soyeon.