Instrumen
- Kim Jung-Bae – gitar (track 1, 3)
- Min Jae-Hyun – bass (track 1, 3, 5)
- Ham Chun-Ho – gitar (track 2)
- Song Gwang-Sik – piano elektrik (track 2, 5)
- K-strings – string (track 2, 3, 5, 6, 8, 9, 11, 12)
- Henry – biola (track 2, 7, 11, 12)
- Song Young-Joo – piano (track 3)
- Ko Tae-Young – gitar (track 4, 11)
- Sam Lee – gitar (track 5, 6, 8, 12)
- Groovie.K – gitar elektrik (track 7); gitar akustik (track 10)
- Gil Eun-Kyung – keyboard (track 8)
- Lee Sung-Ryul – gitar (track 9)
- Yoo Young-Jin – gitar akustik (track 10)
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Vokal Latar Belakang
- Han Geng – tenor, rapper; track 2, 6, 7, 10
- Siwon – baritone; track 2, 6, 7
- Donghae – tenor, rapper; track 2, 6, 7, 10
- Kyuhyun – bass; track 1, 2, 3, 5, 6, 7, 8, 9, 11, 12
- Henry – tenor, rapper; track 6, 7
- Ryeowook – tenor; track 1, 2, 3, 5, 6, 7, 8, 9, 10, 12
- Zhou Mi – tenor, rapper; track 1, 3, 5, 6, 7, 8, 9, 10, 11, 12
- Kenzie – track 1
- Yesung (Super Junior) – baritone; track 2
- Yoo Young-Jin – track 2, 7, 10
- Kim Hyeon-A – track 6, 10
- Hwang Sung-Je – track 9
- Lee Joo-Hyoung – track 9
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