The first member, Jee Won, was revealed across social media on November 10, 2019. On November 11, second member Semi was revealed similarly. On November 12, third member Chaesol was revealed. On November 13, fourth member Sunn was revealed. On November 14, fifth member Belle was revealed. On November 15, sixth member Ye Ah was revealed. On November 16, the seventh and final member Seline was revealed.
On January 14, C9 Entertainment released the group's official name, as well as the new logo. Later that day, it was revealed that C9 established a new subsidiary, called J9 Entertainment, which would focus on girl groups. Thus, Cignature would be transferred to this label.
On January 22, the group's official debut schedule was released. The group's promotional photos were released from January 27 to 28th, with the MV teaser being released on January 30 and the dance practice on 31st. On February 3, the official music video of their first digital single "Nun Nu Nan Na" was released. Lastly, the single was released on February 4th at 6PM KST on various music sites and their debut showcase, "Cignature Move", was held that same day.
|Chaesol (채솔)||Vocalist, Visual||2020–present|
|Jee won (지원)||Leader, Lead Vocalist, Face of the Group||2020–present|
|Ye Ah (예아)||Main Vocalist, Lead Dancer||2020–present|
|Sunn (선)||Main Rapper, Main Dancer, Vocalist||2020–present|
|Seline (셀린)||Lead Vocalist, Lead Rapper||2020–present|
|Belle (벨)||Lead Vocalist, Lead Dancer||2020–present|
|Semi (세미)||Lead Dancer, Vocalist, Maknae||2020–present|
- "Nun Nu Nan Na" (2020)
- ↑ Twitter: First member revealed - Jee Won
- ↑ Twitter: Second member revealed - Semi
- ↑ Twitter: Third member revealed - Chaesol
- ↑ Twitter: Fourth member revealed - Sunn
- ↑ Twitter: Fifth member revealed - Belle
- ↑ Twitter: Sixth member revealed - Ye Ah
- ↑ Twitter: Final member revealed - Seline
- ↑ Soompi: C9 Entertainment Announces Name And Shares Logo For New Girl Group
- ↑ Soompi: C9 Entertainment Establishes New Agency For Girl Groups
- ↑ Soompi: Cignature Kicks Off Preparations For Exciting Debut With Teaser Schedule
- ↑ Star News: 시그니처, 2월 4일 '눈누난나'로 데뷔 확정