Wing Wing

"Wing Wing" is a song recorded by South Korean girl group Kep1er for their first Japanese maxi single marketed as "Fly-Up". It was pre-released as a digital single on August 3, 2022, and as a CD single featuring three other tracks on September 7, 2022, by Wake One Entertainment and Ariola Japan.

Background and release
On July 21, 2022, Wake One Entertainment announced Kep1er would be releasing their Japanese debut maxi single titled "Fly-Up" on September 7. The maxi single features four tracks including "Wing Wing". "Wing Wing" was pre-released alongside its music video on August 3. The maxi single was released on September 7.

Composition
"Wing Wing" was written and composed by KZ, and B.O with Nthonius, and Meisobo participating in the composition. "Wing Wing" was composed in the key of B minor, with a tempo of 128 beats per minute.

Commercial performance
"Wing Wing" debuted at number three on the Billboard Japan Hot 100 in the chart issue dated September 14, 2022; on its component charts, the song debuted at number 40 on the Top Download Songs. It also debuted at number two on the Billboard Japan Top Single Sales in the chart issue dated September 14, 2022. The song debuted at number two on the Oricon Singles Chart, and number two on the Oricon Combined Chart in the chart issue dated September 19, 2022.

Promotion
Following the release of the "Fly-Up", on September 10 and 11, Kep1er held a live event called "Kep1er Japan Debut Showcase LIVE " to introduce the maxi single and communicate with their fans. The group also performed the song on CDTV! Live Live and Venue101 on September 3 and 5.