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"I Do! Do You?" is a song recorded by South Korean girl group Kep1er for their second Japanese maxi single marketed as "Fly-By". It was pre-released as a digital single on February 21, 2023, and as a CD single featuring three other tracks on March 15, 2023, by WakeOne and Ariola Japan.
Background and release
On January 16, 2023, Wake One Entertainment announced Kep1er would be releasing their second Japanese maxi single titled "Fly-By" on March 15. The maxi single features four tracks including "I Do! Do You?". "I Do! Do You?" was pre-released alongside its music video on February 21. The maxi single was released on March 15.
Composition
"I Do! Do You?" was written by Tsingtao, and Ryo Ito, and composed by Jonatan Gusmark, Emily Yeonseo Kim, Moa "Cazzi Opeia" Carlebecker, Ellen Berg, and Moonshine. It was described as a "uptempo" dance song characterized by "funky disco rhythm" with lyrics about "' members subtle feelings about the person they like and their growing feelings". "I Do! Do You?" was composed in the key of C major, with a tempo of 120 beats per minute.
Commercial performance
"I Do! Do You? debuted at number three on the Billboard JapanHot 100 in the chart issue dated March 22, 2023; on its component charts, the song debuted at number 86 on the Top Download Songs. The song debuted at number three on the Oricon Singles Chart, and the Oricon Combined Chart in the chart issue dated March 27, 2023.
Promotion
Prior to the release of "Fly-By", on March 6, 2023, Kep1er performed the song on CDTV! Live Live.
Seon, Mi-kyung (January 16, 2023). "케플러, 3월 15일 日 두 번째 싱글 'FLY-BY' 발표..인기 정조준" [Kepler releases second Japanese single 'FLY-BY' on March 15th..Aiming for popularity] (in Korean). Osen. Retrieved October 15, 2023 – via Naver.
Hwang, Hye-jin (March 15, 2023). "케플러, 오늘(15일) 日 싱글 2집 'FLY-BY' 발매→5월 아레나 투어" [Kepler releases 2nd Japanese single 'FLY-BY' today (15th) → Arena tour in May] (in Korean). Newsen. Retrieved October 15, 2023 – via Naver.
"I Do! Do You?". Retrieved October 15, 2023 – via Apple Music.
Hwang, Mi-hyeon (March 15, 2023). "케플러, 오늘 日 새 싱글 발표...청량·상큼 에너지" [Kepler releases new single today in Japan...Refreshing, refreshing energy] (in Korean). News1. Retrieved October 15, 2023 – via Naver.
^ "週間 シングルランキング – 2023年03月27日付" [Weekly Single Ranking – Published for March 27, 2023]. Oricon (in Japanese). March 13–19, 2023. Archived from the original on March 22, 2023. Retrieved October 15, 2023.
^ "週間 合算シングルランキング – 2023年03月27日付" [Weekly Total Single Ranking – Published for March 27, 2023]. Oricon (in Japanese). March 13–19, 2023. Archived from the original on June 25, 2023. Retrieved October 15, 2023.
Kang, Da-yoon (February 28, 2023). "케플러, 3월 6일 日 'CDTV 라이브! 라이브!' 출연...신곡 무대 최초 공개" [Kepler, March 6th, Japan 'CDTV Live! Live!' Appearance...First public performance of new song] (in Korean). My Daily. Archived from the original on February 28, 2023. Retrieved October 15, 2023 – via Naver.
"月間 シングルランキング – 2023年03月度" [Monthly Single Ranking – March 2023]. Oricon (in Japanese). Archived from the original on April 12, 2023. Retrieved October 15, 2023.
年間 アルバムランキング 2023年度 [Annual Singles Ranking 2023] (in Japanese). Oricon. p. 9. Archived from the original on December 19, 2023. Retrieved December 20, 2023.