[3][4] The members were revealed through various dance videos and song covers from August 6 to November 19 (in order: Jinni, Jiwoo, Kyujin, Sullyoon, Bae, Haewon, and Lily).

[13] On December 9, JYP Entertainment announced that Jinni had terminated her contract with the company due to personal reasons, and had departed from the group, while Nmixx would continue as a six-member ensemble.

They embarked on the Nice to Mixx You Showcase Tour, consisting of 13 dates across the United States and Asia, beginning in May.

[21] On July 17, JYP Entertainment announced that the group would be holding their second fan concert Nmixx Change Up: Mixx Lab, from October 4 to 6 at the Jangchung Arena in Seoul.

[27] Despite the praise towards their vocals, Nmixx's signature style of music, termed "Mixxpop" or "Mixx Pop" (stylized in all caps), has been controversial.

[28] Taylor Glasby of Dazed said that Nmixx's debut single, "O.O", had "choppy arrangement" and "loosely structured lyrics", making note of the fact that ten lyricists were credited for the track.

[28] Writing for Mnet Plus Magazine, Park Soojin said that Mixxpop was less accessible to the public due to "combining vastly different genres into a single song".

[30] Before the announcement, they appeared on the July 2022 cover of Harper's Bazaar Korea in Loewe's Fall 2022 pre-collection.