In July 2012, T-ara released their fourth extended play (EP), with the title "Day by Day". It made it to number five on the "Gaon" chart. The title track, also called "Day by Day", was released as a single on the same day. It made it to number two on the "Gaon" chart. On July 7, T-ara performed "Day by Day" live on "Music Core" with a 70-person orchestra. This was the first time Areum performed with the group.