- Rick Bridges –vocal director (track 1, 5), background vocals (track 1, 5)
- GDLO –vocal director (track 2, 5)
- Ju Chan-yang (Pollen) –vocal director (track 3, 10), background vocals (track 3)
- G-high –vocal director (track 6)
- Seo Mi-rae (Butterfly) –vocal director (track 7, 10), pro tools operator (track 7, 10)
- Ju Dae-gwan –vocal director (track 8), pro tools operator (track 8)
- Noday –vocal director (track 8-9), background vocals (track 10)
- minGtion –vocal director (track 11), piano (track 11), bass (track 11), recording (track 11), digital editing (track 11)
- Jisoo Park –vocal director (track 12), background vocals (track 12)
- Yoo Young-jin –vocal director (track 13), background vocals (track 2, 13), digital editing (track 13), engineered for mix (track 13), mixing (track 13)
- NCT –vocals, background vocals
- Taeil –vocals (track 3, 8, 11, 12-13), background vocals (track 8, 13)
- Johnny –vocals (track 3, 5-6, 13), background vocals (track 13)
- Taeyong –vocals (track 1, 3-4, 13), background vocals (track 13)
- Yuta –vocals (track 3-5, 13), background vocals (track 4, 13)
- Kun –vocals (track 9-11, 13), background vocals (track 13)
- Doyoung –vocals (track 2-3, 6, 12-13), background vocals (track 13)
- Ten –vocals (track 4, 8-9, 13), background vocals (track 2, 4, 13)
- Jaehyun –vocals (track 3, 8, 10-11, 13), background vocals (track 13)
- Jungwoo –vocals (track 2-3, 5, 10, 13), background vocals (track 13)
- Mark –vocals (track 1-4, 6-7, 13), background vocals (track 4, 13), rap making (track 2, 6)
- Xiaojun –vocals (track 2, 8-9, 12-13), background vocals (track 2, 13)
- Hendery –vocals (track 4-5, 9-10, 13), background vocals (track 13)
- Renjun –vocals (track 6-7, 12-13), background vocals (track 13)
- Jeno –vocals (track 2, 4, 6-7, 13), background vocals (track 4, 13)
- Haechan –vocals (track 2-3, 7-8, 11, 13), background vocals (track 8, 13)
- Jaemin –vocals (track 2, 5-7, 13), background vocals (track 13)
- Yangyang –vocals (track 1-2, 4, 6, 9, 13), background vocals (track 1, 4, 13)
- Shotaro –vocals (track 2, 5, 10, 13), background vocals (track 13)
- Sungchan –vocals (track 6, 8, 13), background vocals (track 13)
- Chenle –vocals (track 5, 7, 10-11, 13), background vocals (track 5, 13)
- Jisung –vocals (track 5, 7, 10, 13), background vocals (track 5, 13)
| - Junny –background vocals (track 2, 7, 11)
- Ebenezer –background vocals (track 3)
- Kenzie –background vocals (track 4)
- Oiaisle –background vocals (track 6)
- MarcLo –background vocals (track 6)
- Dwilly –background vocals (track 6)
- Justin Starling –background vocals (track 9)
- Jeffrey Okyere-Twumasi –background vocals (track 9)
- Adrian McKinnon –background vocals (track 9)
- No Min-ji –recording (track 1-2, 4, 7-8, 12), digital editing(track 1-2, 4-5, 10), engineered for mix (track 10)
- Kang Eun-ji –recording (track 2-3, 5, 10-12), digital editing(track 3, 6), engineered for mix(track 3-4, 6, 12)
- Lee Min-gyu –recording (track 6, 12), mixing (track 6, 8, 10), engineered for mix (track 11)
- Jung Yu-ra –recording (track 7, 9, 12), engineered for mix (track 8), digital editing (track 12)
- Xu Tian Hong –recording (track 8-9)
- On Seong-yun –recording (track 9)
- Jung Ho-jin –digital editing (track 2, 5, 9)
- Kwon Yu-jin –digital editing (track 7-8), recording (track 8, 10-11)
- Lee Ji-hong –engineered for mix (track 5, 9), mixing (track 9, 12)
- Jung Ui-seok –mixing (track 1, 3-4)
- Nam Gung-jin –mixing (track 5, 7)
- Kim Cheol-sun –mixing (track 2, 10)
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