[2] On February 10, Kim Dani was confirmed to be joining the project and announced the program's name T-ara's Little Sister Girl Group.

[3] In June, MBK Entertainment announced that they had cancelled their plans for a survival program, and decided to select the members internally.

The final three members, Yebin, Eunice, and Jenny were revealed and the group was set to debut in August under the name DIA.

[4] MBK announced a line-up with six members: Eunice, Huihyeon (originally under the stage name Cathy), Jenny, Yebin, Eunjin, and Chaeyeon.

[6] Eunchae (introduced with her real name Chaewon) joined as a new member in March 2016,[7][8] and in April, Seunghee was confirmed to have left the group.

[9] DIA's first mini-album Happy Ending was released on June 14, 2016, along with the music video for lead single "On the Road" on the same day.

[13][14] On April 6, the group released a pre-release single titled "You Are My Flower", which featured trot singers Kim Yeon-ja and Hong Jin-young.

[15] DIA's reality show subsequently began airing on April 9 on the TV network Onstyle, days after two new members, Jueun and Somyi, were announced.

On February 20, MBK Entertainment confirmed both DIA's comeback and the single would be produced by Shinsadong Tiger and marks their first release as seven members without Jenny due to a knee injury.

[36][37] On May 25, 2020, it was revealed that DIA would make a comeback with their sixth EP Flower 4 Seasons on June 10, marked their first release under PocketDol Studio.