Mimi
- Name
- Not confirmed yet
- Born
- Not confirmed yet
Left Jellyfish in April 2021 and told fans in a letter on Instagram.
구구단Girl group · Jellyfish Entertainment · since 2016· 3rd generation
Jellyfish's first girl group staged each release as a play, from The Little Mermaid to Puss in Boots, and two members also sang in I.O.I. They disbanded on 31 December 2020.
11years on 28 June 2027 · in 227 days

gugudan was the first girl group Jellyfish Entertainment ever put together. Three of its trainees, Nayoung, Sejeong and Mina, had already been seen on Produce 101, and Sejeong and Mina spent 2016 in I.O.I at the same time. In June the company revealed nine members and a name meant to suggest nine girls with nine different charms. Act. 1 The Little Mermaid came out on 28 June, with "Wonderland" as the title song.
gugudan presented itself as an idol theatre troupe, and each release was a new production. Narcissus borrowed from a Caravaggio painting and filled its video with mirrors and selfies. "Chococo" moved into Willy Wonka's factory, "The Boots" took on Puss in Boots, and "Not That Type" was inspired by the heist film Ocean's 8. The concept gave fans a reason to guess at the next chapter.
Between the acts the members split into units. Mina and Hyeyeon released the summery "Ice Chu" as gugudan 5959 in 2017, and in 2018 Sejeong, Mina and Nayoung tried a funky, blues-based sound as SeMiNa. A Japanese debut followed that September. In October 2018 Hyeyeon left the group. The remaining eight released Act. 5 New Action in November, which turned out to be their last group release.
Two quiet years followed. On 30 December 2020 Jellyfish announced that gugudan would end its activities the next day, and leader Hana thanked the Danjjak in a handwritten letter. In April 2021 Mimi, Soyee and Nayoung left the agency. Sejeong kept up her solo work with the EPs Plant and I'm, and Sally had joined China's BonBon Girls 303 back in 2020.
Nayoung, Sejeong and Mina appear on Produce 101 as Jellyfish trainees.
Debut as nine with the EP Act. 1 The Little Mermaid and "Wonderland".
EP Act. 2 Narcissus, led by "A Girl Like Me".
Mina and Hyeyeon debut as the unit gugudan 5959 with "Ice Chu".
Single album Act. 3 Chococo Factory, inspired by Charlie and the Chocolate Factory.
Single album Act. 4 Cait Sith, with "The Boots".
Sejeong, Mina and Nayoung debut as the unit gugudan SeMiNa.
Japanese debut with Stand By and a showcase in Tokyo.
Hyeyeon has left the group, and the eight others release Act. 5 New Action and "Not That Type".
gugudan disbands after four and a half years.
13 November 2026
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The Fan Chart on The Crowd adds up every fan's top 10. Here is where gugudan stands.
Left Jellyfish in April 2021 and told fans in a letter on Instagram.
Wrote a handwritten farewell letter to the Danjjak after the disbandment news of December 2020.
Her August birthday, with Sejeong's and Hyeyeon's, set the theme of the first fan meeting in 2016.
A Jellyfish trainee on Produce 101 and one third of SeMiNa. She left the agency in April 2021.

Came second on Produce 101, sang in I.O.I and released the solo EPs Plant and I'm.
Finished sixth on China's Produce Camp 2020 and joined the group BonBon Girls 303.
Left Jellyfish in April 2021, announcing it on the same day as Mimi.

Sang in I.O.I in 2016 and formed the unit gugudan 5959 with Hyeyeon a year later.
Portraits, cropped from Wikimedia Commons: Sejeong, June 2025: K-POPIT 케이팝잇, CC BY 3.0 · Mina, April 2026: TV10, CC BY 4.0
Units: gugudan 5959 (Mina and Hyeyeon) released "Ice Chu" in August 2017, and gugudan SeMiNa (Sejeong, Mina and Nayoung) released the single album SEMINA in July 2018. In Japan: Stand By (September 2018). The group also sang on Jellyfish's Jelly Christmas 2016 single "Falling".
Korean for a best friend. Hana addressed her farewell letter of December 2020 to the Danjjak.
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On 28 June 2016, with the EP Act. 1 The Little Mermaid and the title track "Wonderland". The showcase was held the same day at Yes24 Live Hall in Seoul.
The final line-up was Mimi, Hana (leader), Haebin, Nayoung, Sejeong, Sally, Soyee and Mina. Hyeyeon, one of the original nine, left the group in October 2018.
Danjjak (단짝), Korean for a best friend. Hana addressed her farewell letter of December 2020 to the Danjjak.
Jellyfish said it stands for nine girls with nine different charms, a troupe that performs songs full of hopes and dreams. The name came out of a naming contest inside the company.
No. Jellyfish announced on 30 December 2020 that group activities would end the next day, after long talks with the members. Their last group release was Act. 5 New Action in November 2018.
Know your gugudan?Six K-pop questions a day in the Daily, and a collectible card for every finished set.
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