The song is No. 1 on Oricon’s daily singles chart! The single reached No. 1 on the July 17 chart with 58,172 estimated sales. Congratulations to TWICE!. This release included DVD Type-A & B for music video.

(TWICE 트와이스 – HAPPY HAPPY) [2019.07.17] ISO / Lossless / DVD / Version B – 2019 1.25 GB
ISO / Lossless / DVD / Version A – 2019 1.47 GB
FLAC / Lossless / WEB 30.37 MB
FLAC / Lossless / WEB / Regular Edition – 2019 101.79 MB

01. HAPPY HAPPY
02. The Best Thing I Ever Did Japanese ver.
03. HAPPY HAPPY (collapsedone Remix)
04. HAPPY HAPPY (Instrumental)

DVD A
1. 「HAPPY HAPPY」 Music Video
2. 「HAPPY HAPPY」 Music Video Making Movie

DVD B
1. 「HAPPY HAPPY」 Music Video Lip Sync Ver.
2. Jacket Shooting Making Movie