Pre-debut activities Prior to joining Modhaus, several members were already involved in the entertainment industry. Jeong Hye-rin was a child actress under Kids Planet, making her acting debut in the 2018 web-series
Between Us; she also appeared in a commercial for Japanese textbooks. Kim Na-kyoung is the younger sister of singer
Bibi and appeared in the final episode of
SBS competition show
The Fan. Hye-rin and Na-kyoung were former
P Nation trainees.
Lee Ji-woo was a former
SM Entertainment,
JYP Entertainment,
YG Entertainment, and
FNC Entertainment trainee. She made her acting debut in the web drama
I:Love:Dm.
Seo Da-hyun was a former
Source Music trainee. In 2021, she appeared on an episode of popular Korean reality web-show
Sixth Sense. Kim Soo-min previously auditioned for P Nation and
Jellyfish Entertainment. Kaede was a former child model, and she was an exclusive model for the Japanese magazine
Nico Petit until 2019; after she left she became a model for clothing brands Lindiha and Lizlisa.
Kim Chae-yeon is a former member of
Busters and CutieL as well as an actress and television host for children's television shows
Cooking Class,
Tok!Tok! Boni Hani, and
Quiz Monster. Park So-hyun was a popular
ulzzang on social networks. Lee Ji-woo and
Kim Yoo-yeon were contestants on the
MBC survival show
My Teenage Girl, where Ji-woo was the lead actress for the show's teasers. Ji-woo was eliminated in the sixth round ranking 18th, while Yoo-yeon was eliminated during the final episode placing 8th. Gong Yu-bin was a contestant on the
TV Chosun junior cooking show
I am Chef, making it to the Top 3. Kotone, Nien, and Xinyu were contestants on the
Mnet survival show
Girls Planet 999; Kotone and Xinyu were eliminated in the 11th episode, with Kotone ranking P24 and J09, and Xinyu ranking P22 and C07, while Nien was eliminated on the 8th episode ranking C15. Kim Chae-won was a contestant on
SBS survival show
Universe Ticket, and was eliminated in the first round, ranking 70th.
2022: Launching and first sub-unit's debut On February 18, 2022, Modhaus announced that they would be launching the world's first "fan-participating girl group", and that the group was set to unveil in the first half of the year. The group is led by the CEO Jaden Jeong who worked with companies such as
JYP Entertainment,
Woollim Entertainment,
Sony Music Korea, and
Blockberry Creative. The first set of members were revealed every fortnight between May 2022 until September 2022, in the order: Yoon Seo-yeon, Jeong Hye-rin, Lee Ji-woo, Kim Chae-yeon, Kim Yoo-yeon, Kim Soo-min, Kim Na-kyoung, and Gong Yu-bin. On July 12, it was announced that TripleS will be collaborating with
GS25. GS25 will be selling TripleS collaboration set products and offline photocards during the second half of 2022. On August 8, TripleS released their official app Cosmo, as well their first bundle of digital photocards which are changed into an
NFT token to vote in future events on the app. On September 16, it was announced that TripleS will start to prepare for sub-unit debut activities. The two sub-units were
Acid Angel from Asia and
Krystal Eyes, with Acid Angel from Asia having their debut activities first in October. Acid Angel from Asia made their official debut on October 28, 2022, with the EP
Access. The debut made both commercial and critical success; "
Generation" was nominated on
SBS M's
The Show, and
Access reached No. 1 on the
iTunes US K-POP album chart. The second set of members were revealed in November in the order: Kaede and Seo Da-hyun. In November, TripleS announced they would be debuting a 10-member unit during the beginning of 2023. Fans would be able to vote out of 8 songs which song they would want as the title track. On December 28, TripleS announced they would begin to branch out into Japan in January 2023.
2023: Debut with 10 members, debuts of units, world tour The third set of members were unveiled from January 2, 2023, in the order: Kotone, and Kwak Yeon-ji. On February 13, all of the members, excluding Kotone and Kwak Yeon-ji, released their debut EP
Assemble, with the title track "Rising". On March 17, it was confirmed that
Krystal Eyes, the group's second sub-unit, will debut on the first week of May. On March 20, Nien was revealed as the group's 13th member. On April 14, Park So-hyun was revealed as the group's 14th member and later on, an announcement video confirmed that So-hyun would produce music for the Krystal Eyes project. On April 22, TripleS, through Cosmo, held a voting for fans to select from the 14 revealed members and form two new sub-units (named Lovelution and Evolution) with eight members each. On April 29, the seven-member lineups for Lovelution and Evolution were decided, and it was then revealed that the two sub-units would be completed with the upcoming 15th and 16th members. On May 4, the second unit Krystal Eyes released their debut EP
Aesthetic with the lead single "Cherry Talk", however without the release of the lead single's music video. The unit made their debut stage in
M Countdown on the same day. The next day, Modhaus released a statement through
Discord that "restrictive forces" were preventing Krystal Eyes from performing on any music shows other than
M Countdown and that their debut music video had been delayed. Later that day, the music video for "Cherry Talk" was released. On June 1, it was announced that
Acid Angel from Asia and Krystal Eyes would release an album titled
Cherry Gene as a combined sub-unit, and the group's third sub-unit, named Acid Eyes. The lead single and accompanying visualizer were released on June 6, with the physical album released in July. Between June and August 2023, members Yoon Seo-yeon and Lee Ji-woo took part in the
Mnet reality competition show
Queendom Puzzle. Seo-yeon was eliminated in episode 7, finishing 24th, while Ji-woo finished 13th in the final episode. In July 2023, Xinyu and Mayu were revealed as the 15th and 16th members, joining Lovelution and Evolution respectively. On July 28, TripleS announced that they would hold their first world tour, with its first leg to proceed with their upcoming fourth sub-unit Lovelution, titled "TripleS 1st World Tour 'Authentic' Lovelution in US" starting on September 24 in
Atlanta and ending on October 14 in
Los Angeles. On August 17, the group's fourth sub-unit Lovelution officially debuted with the EP
Muhan and its accompanying title track, "Girls' Capitalism". On October 11, the group's fifth sub-unit Evolution officially debuted with the EP
Mujuk and its title track, "Invincible". On October 25, the second leg of TripleS' first world tour was announced, with their fifth sub-unit Evolution, titled "TripleS 1st World Tour [Authentic] Evolution in Australia". It started from December 20 in
Melbourne and ended on December 23 in
Brisbane. On December 12, TripleS' upcoming sub-unit Aria was announced. The sub-unit, which would focus on ballad music, was formed through fan voting wherein four members were selected to join the group's main vocalist, Seo Da-hyun. It was then confirmed that
Heize had contributed to the lyrics on the project. On December 19, TripleS' sixth sub-unit NXT was announced, and would consist of four new members. It marks the group's first sub-unit to be formed without fan voting. Starting from December 21, the members were introduced: Lynn, Joobin, Jeong Ha-yeon, and Park Shi-on. On December 23, NXT debuted with the digital single "Just Do It".
2024: Debuts of Aria, the full group, Glow, Visionary Vision, and Hatchi TripleS' seventh sub-unit Aria debuted with the single album
Structure of Sadness on January 15, 2024. TripleS then held their concert titled "tripleS Authentic in Seoul" on February 3 and 4, The first day featured performances by two sub-units, Lovelution and Evolution, and the second day featured all 20 members that had been introduced. TripleS also announced in the concert that the full group composed of 24 members will debut with "Assemble24" at a later date. Starting April 1, TripleS announced their final four members, in the order: Kim Chae-won, Sullin, Jeong Hae-rin, and Ji Suh-yeon, to complete the group's full line-up. A fan vote was held from April 5 to 7, to determine the stage names of the latter two members; the vote ended with Jeong Hae-rin's stage name SeoAh, and Ji Suh-yeon's stage name JiYeon. The four members aforementioned would also be under the group's new sub-unit Glow, for potential future activities. TripleS made their full group debut with the first studio album
Assemble24 on May 8. The album contains ten tracks, with the lead single "Girls Never Die". The full group took their first music show win on May 14, through
The Show. The group will also held a fan concert called "Girls Never Stop" in Seoul on July 6 and 7. On June 14, TripleS announced a new 12-member sub-unit Visionary Vision (VV) that would debut by the second half of 2024. The sub-unit, which would focus on dance, was formed through fan voting of nine members and internal selection of one member to join Gong Yu-bin and Lynn, who were the pre-selected members for the sub-unit. The final lineup for Visionary Vision was announced on June 18. On June 21, TripleS' eighth sub-unit Glow debuted with the digital single "Inner Dance". On September 14, TripleS announced Hatchi (∞!) as the name of the official Japanese sub-unit of the group, which consists of eight members. Hatchi was formed through fan voting of six members to join Mayu and Park Shi-on, who were the pre-selected members for the sub-unit. On October 23, TripleS' ninth sub-unit Visionary Vision debuted with their first album
Performante, which contains ten tracks including the lead single "Hit The Floor". On November 20, TripleS' tenth sub-unit, and the group's official Japanese sub-unit Hatchi debuted with the single "Untitled".
2025: Assemble25, new unit Alphie, Hatchi's comeback, MSNZ project On May 12, 2025, TripleS released their second studio album as a full group,
Assemble25, led by the title track "Are You Alive". TripleS' eleventh sub-unit Alphie, and its eight members, were announced for the group's world tour "@%(Alpha Percent)", starting from nine cities in North America in September 2025, followed by Seoul on October 11 and 12, and Taipei on November 9 as the concluding stop. On September 3, TripleS announced MSNZ, a project that would form four sub-units of six members each: Moon, Sun, Neptune, and Zenith. Through an advance drawing of lots, the leaders of the sub-units were determined to be Sullin, Xinyu, Yoon Seo-yeon, and Jeong Ha-yeon respectively. Subsequently, through fan votes held from September 4 to 9, the lineups of the four sub-units were finalized. A second fan vote for the project was held from September 19 to 21, to determine each of the sub-unit's title tracks. TripleS' official Japanese sub-unit Hatchi released their first EP
SecretHimitsuBimil on October 1. The lead single of the album, titled "Password", was pre-released on September 17. TripleS, as MSNZ, released the EP
Beyond Beauty on November 24. The EP included the four title tracks from the four sub-units: "Cameo Love" by Moon, "Bubble Gum Girl" by Sun, "Fly Up" by Neptune, and "Q&A" by Zenith, plus a special track "Christmas Alone" performed by all 24 members.
2026–present: ''Assemble26 'Love & Pop''' On January 26, 2026, TripleS announced
Assemble26 "Love & Pop", whereby two full group releases would be made within 2026, one in the first half and one in the second half of the year. It was then announced on May 1 that the group's third studio album as a full group would be released in three parts, with the first part
Love on June 1, the second part
& within 2026, and the third part
Pop on January 2027. ==Endorsements==