Wa Da Da

Kep1er was originally scheduled to debut on December 14, 2021, with their first EP First Impact, with pre-orders beginning on November 29.^{[1][unreliable source?]} However, it was announced that the group's scheduled debut had been delayed to January 3, 2022, due to one of their staff members having tested positive for COVID-19.^[2][3] On December 14, it was revealed that group members Mashiro and Xiaoting tested positive for COVID-19.^{[4][unreliable source?]} On December 26, Kep1er's agency announced that Xiaoting and Mashiro have fully recovered from COVID-19.^[5]

On January 3, 2022, the song was released together with its accompanying music video.^[6]

"Wa Da Da" was written by BuildingOwner (PrismFilter), Elum (PrismFilter), and Shannon, Danke, Hwang Yu-bin, Odal Park, Lee Seu-ran, and Kako, composed by BuildingOwner (PrismFilter), Elum (PrismFilter), and Shannon, and arranged by BuildingOwner (PrismFilter).^[7] Musically, the group is described as "dance song based on big room house genre" with lyrics about "Kep1er's bold aspiration to become the best and the promise to repay [their] fans who have supported and protected the nine girls' dreams".^[8] "Wa Da Da" was composed in the key of B-flat major, with a tempo of 126 beats per minute.^[9]

"Wa Da Da" debuted at position 130 on South Korea's Gaon Digital Chart in the chart issue dated January 9–15, 2022,^[10] ascending to position 79 in the chart issue dated January 30 – February 5, 2022.^[11] The song also debuted at position 21 on Gaon Download Chart in the chart issue dated January 2–8, 2022.^[12] On the Billboard K-pop Hot 100, the song debuted at position 84 in the chart issue dated January 5, 2022,^[13] ascending to position 71 in the following week.^[14] In Japan, the song debuted at position 20 on the Billboard Japan Japan Hot 100 in the chart issue dated January 12, 2022,^[15] ascending to position 9 in the chart issue dated January 26, 2022.^[16] The song also debuted at position 21 on the Oricon Combined Singles in the chart issue dated January 17, 2022,^[17] ascending to position 7 three weeks later.^[18]

In New Zealand, the song debuted at position 24 on RMNZ Hot Singles in the chart issue dated January 10, 2022.^[19] In Singapore, the song debuted at position 11 on the RIAS Top Streaming Chart in the chart issue dated January 7–13, 2022.^[20] The song also debuted at position 11 on the RIAS Top Regional Chart in the chart issue dated December 31, 2021 – January 6, 2022, ascending to position 3 in the chart issue dated January 7–13, 2022.^[21][20] In Vietnam, the song debuted at position 73 on the Billboard Vietnam Vietnam Hot 100 in the chart issue dated January 20, 2022.^[22]

In the United States, the song debuted at position 13 on the Billboard World Digital Song Sales in the chart issue dated January 15, 2022.^[23] Globally, the song debuted at position 117 on the Billboard Global 200 in the chart issue dated January 22, 2022,^[24] ascending to position 77 in the following week.^[25] The song also debuted at position 171 on the Billboard Global Excl. U.S. in the chart issue dated January 15, 2022,^[26] ascending to position 60 in the chart issue dated January 22, 2022.^[27]

Prior to the extended play's release, on January 3, 2022, Kep1er held a debut showcase to introduce the extended play and its song including "Wa Da Da".^[28] Following the release of the extended play, the group performed "Wa Da Da" on three music programs on the first week: KBS2's Music Bank on January 7, MBC's Show! Music Core on January 8, and SBS's Inkigayo on January 9.^[29][30][31] On the second week of the song release, the group performed on Mnet's M Countdown on January 13, and KBS2's Music Bank on January 14, where they won first place in both appearances.^[32][33] On the third week of the song release, the group performed on Mnet's M Countdown on January 20, where they won first place.^[34]

Credits adapted from Melon.^[7]

• Kep1er – vocals
• BuildingOwner (PrismFilter) – lyrics, composition, arrangement
• Elum (PrismFilter) – lyrics, composition
• Shannon Bae – lyrics, composition
• Danke – lyrics
• Hwang Yu-bin – lyrics
• Odal Park – lyrics
• Lee Seu-ran – lyrics
• Kako – lyrics