"Inside Out" is a song recorded by South Korean boy band Day6 for their fourth studio album, The Decade. It was released as the album's lead single alongside the song "Dream Bus" by JYP Entertainment on September 5, 2025.
Background and release On August 18, JYP Entertainment first revealed that Day6 would have a double title track through Day6's social media accounts as the track list was posted. On August 30 and 31, Day6 held a debut 10th anniversary tour 'DAY6 10th Anniversary Tour The Decade' at the Goyang Stadium in Goyang, in which they first performed "Inside Out".
Composition "Inside Out" Is written by Young K and composed by Young K, Sungjin, Wonpil and Hong Ji-sang. The song is composed in the key B Minor and has 127 beats per minute and a running time of 3 minutes.
Credits and personnel Credits adapted from Melon.
Personnel
Lyrics – Young K Composer – Sungjin, Young K, Wonpil, Hong Ji-sang Arranger – Hong Ji-sang Original publisher – JYP Entertainment Sub-publisher – JYP Entertainment Computer programmer – Hong Ji-sang Background vocals – Sungjin, Young K, Wonpil Electric guitar – Sungjin, Hong Ji-sang Bass – Young K, Hong Ji-sang Keyboards – Wonpil, Hong Ji-sang Percussions – Hong Ji-sang Drums – Dowoon Drum technicians – Jeon Dae-jeong, Hong Seok-in Recorder – Hong Ji-sang @ Jisang's Studio Drum recorder – Shin Bong-won, Park Nam-joon @ GLAB Studios Mixer – Lee Tae-seop @ JYPE Studios Mixer – Dolby Atmos by Shin Bong-won (Asst. Park Nam-joon) @ GLAB Studios Mastered – Park Jung-eon @ Honey Butter Studio
Charts
Weekly charts + Chart (2025) Peakposition South Korea (Circle)22 South Korea (K-pop Hot 100)10
Monthly charts + Chart (September 2025) Peakposition South Korea (Circle) 38
Release history + Region Date Format Label Various September 5, 2025 JYP
References