Eunice
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A debut member from 2015 and one of the five who promoted Flower 4 Seasons in 2020.
다이아Girl group · MBK Entertainment · since 2015· 3rd generation
MBK's girl group that lent Chaeyeon to I.O.I and waited almost three years for a first win, with "Woo Woo" on The Show. Group activity stopped when the contracts ran out in September 2022.
12years on 14 September 2027 · in 305 days
MBK Entertainment, the company behind T-ara, launched DIA in September 2015 with a full album rather than a single. Do It Amazing, led by "Somehow", gave the group its backronym: DIA is short for diamond, but also for the album title. The line-up started changing almost at once: leader Seunghee left in the spring of 2016 to concentrate on acting.
In early 2016 Chaeyeon and Cathy, who later promoted as Huihyeon, stepped away to compete on Mnet's Produce 101. Chaeyeon made the final eleven and spent the year in I.O.I alongside her DIA work. Back home the group added Eunchae for "On the Road" that June, held a first solo concert at Christmas and opened the fan club AID. In April 2017 Jueun and Somyi joined for the album YOLO, which reached No. 3 on the Gaon album chart.
Success on the music shows still took time. After a break of almost a year, Summer Ade and its Miami bass title track "Woo Woo" finally brought a first win on The Show in August 2018, nearly three years after the debut. The same album showed another side of the group: Jueun, Yebin and Huihyeon each co-wrote one of its b-sides. "Woowa" followed in 2019 with a retro look.
In 2020 DIA moved to Pocketdol Studio and released Flower 4 Seasons as a five-member unit. Two quiet years followed. For the seventh anniversary, on 14 September 2022, all six remaining members came back with "The blinding past". Three days later the contracts expired, and Korean media reported the end of the group. Pocketdol asked fans to follow each member in her new start, and Chaeyeon was by then also working as an actor, in MBC's The Golden Spoon.
Debut with the album Do It Amazing and "Somehow".
Chaeyeon and Cathy (later Huihyeon) compete on Produce 101, and Chaeyeon joins I.O.I.
Leader Seunghee leaves the group.
EP Happy Ending and "On the Road", with new member Eunchae.
EP Spell, led by "Mr. Potter".
First solo concert and the launch of the fan club AID.
Second album YOLO and "Will You Go Out with Me?", the first release with Jueun and Somyi.
EP Love Generation and "Can't Stop".
Eunjin leaves the group.
First music show win, on The Show, with "Woo Woo".
EP Newtro, with "Woowa".
EP Flower 4 Seasons, promoted by five members.
"The blinding past" on their seventh anniversary.
The contracts with Pocketdol Studio expire, and Korean media report the end of the group.
13 November 2026
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A debut member from 2015 and one of the five who promoted Flower 4 Seasons in 2020.
Debuted as Cathy, competed on Produce 101 and co-wrote the 2018 b-side "Blue Day".
Co-wrote the b-side "Sweet Dream" and sang "Seoraksan in October" with Somyi in 2017.

Joined I.O.I through Produce 101 in 2016. Acted in MBC's The Golden Spoon in 2022.

Joined in June 2016, introduced at first under the name Chaewon.
Joined in April 2017 and co-composed the 2018 b-side "Take Me".
Portraits, cropped from Wikimedia Commons: Chaeyeon, November 2025: TV10, CC BY 4.0 · Eunchae, June 2018: Irfan410, CC BY-SA 4.0
"You Are My Flower" (April 2017) is a trot collaboration with Kim Yeon-ja and Hong Jin-young. After Spell the group also promoted in two units, BinChaenHyunSeuS and L.U.B. Flower 4 Seasons was promoted by five members, without Chaeyeon and Somyi.
The name of the official fan club, pronounced like "ade". Its first generation opened in late 2016.
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On 14 September 2015, with the album Do It Amazing and "Somehow".
The final line-up was Eunice, Huihyeon, Yebin, Chaeyeon, Eunchae and Jueun. Eunchae joined in 2016 and Jueun in 2017. Seunghee, Eunjin, Jenny and Somyi were members at earlier stages.
AID. The first generation of the official fan club opened in late 2016, and its launch was held at Yes24 Live Hall that December.
Yes. Jung Chae-yeon was picked for I.O.I through Produce 101 in 2016 and rejoined DIA after I.O.I's group promotions. Huihyeon, then called Cathy, also competed on the show.
Not as an active group. Their contracts with Pocketdol Studio expired on 17 September 2022, and Korean media reported that DIA would disband. Three days earlier they released "The blinding past" for their seventh anniversary.
Know your DIA?Six K-pop questions a day in the Daily, and a collectible card for every finished set.
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