In late March 2013, T-ara's agency Core Contents Media were in the midst of forming a new unit from the group with the members Eunjung, Areum, Jiyeon and Hyomin. The unit's name, T-ara N4 (which stands for "T-ara Brand New 4") was revealed April 12, 2013. T-ara previously tried sub-units with the promotions of their sixth Japanese single "
Bunny Style!", in which the B-sides were sung by units of two and three members; however it would be their first time official unit activities. T-ara N4's debut single, "
Jeon Won Diary" (전원일기;
Jeon-won Ilgi), was inspired by the 1980s South Korean drama of the same name. Produced by
Duble Sidekick, the song is said to have "funky and intense" dance music combined with elements of hip-hop, with the main motif of "Jeon Won Diary" about breaking away from the same everyday routine. On July 10, 2013, Areum left the group to pursue her solo career.
Core Contents Media announced that Dani would occupy Areum's positions only in the T-ara N4 sub-unit, while in May 2012 Dani was originally revealed to join T-ara as the ninth member following the completion of her training. As of October 2014, their agency decided that Dani would not be part of T-ara N4 and continue as a trainee under the agency instead. ==Discography==