In July 2017, C9 Entertainment announced their first girl group, temporary named C9 Girls. On July 7, the ten members are revealed along with the group name, GOOD DAY. From July 20 to August 20, the group's reality show GOOD DAY 2 U aired on V Live.
On August 30, 2017, GOOD DAY debut with their mini album All Day Good Day, with Rolly serving as the title track. The three B-side tracks are performed by the group's subunits: Good Morning, Good Night, and Midnight. The group's members had no other activities together until C9 Entertainment announced a new girl group named Cignature with former members of GOOD DAY.
Following the disbandment of GOOD DAY, all the members went their separate ways: - From November 10 to November 16, 2019, Chaesol, Jiwon, Haeun, Viva, and Lucky were revealed to be members of Cignature. The group debuted on February 4, 2020 with the digitial single "Nun Nu Nan Na". They later disbanded on December 3, 2024.
- Haeun and Viva left cignature in April 2021 and are now part of the pre-debut group ALDL. - After cignature's disbandment, Jiwon debuted as a soloist on August 25, 2025 with the digital single "Devil's Jam" - On April 28, 2020, Genie, Cherry, Nayoon, and Bomin were revealed to be members of REDSQUARE. - REDSQUARE disbanded due to their rebranding as IRRIS in June 2022.
Genie, Cherry and Nayoon all became members of IRRIS. - Bomin was revealed as a member of the pre-debut group ALDL. - Heejin became a music producer and lyricist as a member of a production group called Solcire.
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