It was released on November 29, 2018, by RBW as the lead single from the group's eighth extended play (EP), Blue;s. A "comforting" breakup song, "Wind Flower" was produced by Kim Do-hoon and Park Woo-sang and written by them and Mamamoo member Moonbyul.

The song became a top-ten hit in South Korea, reaching number nine on the Gaon Digital Chart and ten on the Billboard K-pop Hot 100.

[6] The Japanese version of "Wind Flower" was released alongside the B-side "Sleep Talk" as Mamamoo's second Japanese-language single on February 6, 2019.

[6] The Korea Herald remarked that with "Wind Flower", "Mamamoo gives the exhausted theme of romance gone wrong a groovy makeover" yet still "anything but a cliche."

"[10] "Wind Flower" has also been called a song that "captures the sentimental sensibility" of the group and displays the "lonely and faint feelings which a person has after separation from a lover.