Nicky (니키), also known by her birth name Kim Eunbi (김은비), first debuted as a ballad singer on November 15th, 2017, with the single “마지막 남자 (My Last Man)”. In 2018, she joined her first girl group, AiRiSU, as Eun Bi. They quietly disbanded after one single, and in 2020 she re-debuted under the stage name Nicky in Q.O.S as a rapper, officially leaving the group in 2021.

Since 2021, Nicky mainly uploads covers of various pop songs, occasionally with E.RE—the two form a currently inactive duo named FluLin (플루린). She is currently a violinist in two live performance teams: REALPLAYERS and Just Fine (저스트파인).