On September 15, 2022, WM Entertainment announced that Chaeyeon, former member of Iz*One, would be debuting as a soloist in October 2022.

[2] On September 29, it was announced Chaeyeon would be releasing her first extended play titled Hush Rush on October 12.

The lead single "Hush Rush" was described as a "emotional" dance-pop song with lyrics about "feeling the most freedom on stage like a vampire who wakes up and dances freely under the moonlight and falls in love with that self".

The second track "Danny" was described as a "80s vibe" synth-pop song with lyrics about "the comparison of fan's relationship with their idols for a long time to a lifelong couple".

[8] Prior to the release of Hush Rush, Chaeyeon held a live event to introduce the extended play and its song, and to communicate with her fans.