- H.O.T.
- Moon Hee-joon – vocals, rap, digital editing(tracks 1, 6, 10), piano(1), sampling(1, 6), chorus(1, 4, 6, 9, 12), backing vocals(2–3, 5, 11, 14), mixing(1, 6, 10)
- Kangta – lead vocals, computer programming(tracks 2–3, 5, 11, 14), backing vocals(2–3, 5, 11, 14), chorus(4, 6, 8–9, 12)
- Tony Ahn – vocals, rap, backing vocals(tracks 2–3, 5, 11, 14), chorus(4, 9, 12), digital editing(8, 12)
- Jang Woo-hyuk – rap, backing vocals(tracks 2–3, 5, 11, 14), digital editing(4, 9), chorus(4, 9, 12)
- Lee Jae-won – rap, backing vocals(tracks 2–3, 5, 11, 14), chorus(4, 9, 12), digital editing(7, 13)
- Session
- Song Gwang-sik – piano(tracks 1, 4, 9, 14)
- Groovie K – other(tracks 1, 7, 9, 10, 12, 13)
- Park In-young – string arrangement(tracks 1, 10)
- Kim Jin-mi and 23 others – string music(track 1)
- Oh Yo-hwan, Oh Jo-hwan and 8 others – string music(tracks 2, 5, 14)
- Oh Yo-hwan, Oh Jo-hwan – string music(tracks 4, 9, 12)
- Gary Chung – other(tracks 3–5, 8, 9, 11, 14)
- Lee Tae-yun – bass guitar(tracks 4–6, 9, 10, 12–14)
- Lee Jeong-sik – saxophone(tracks 4, 6)
- Little Peace Children's Choir – chorus(track 6)
- Yoon Chi-woong – digital editing(track 8)
- DJ Murf – scratch(track 9)
- Suho Kang – drums(tracks 10, 12, 14)
- Hunihoon – rap lyricist(track 13)
| - Staff
- Lee Soo-man, H.O.T. – producers
- Yeo Doo-hyun – mixing(tracks 1, 6, 7, 13), recording
- KAT – mixing (10), recording
- Jeon Hoon (Sonic Korea) – mastering
- Kim Kyung-wook – production
- Hong Hyun-jong, Park Won-young – promotion
- Kim Ki-beom, Cheon Kang-soo, Kim Yeon-jeong, Lee Kyung-min – promotional assistants
- Seong Moon-seok, Choi Mi-sook, Kim Eun-ah, Lee Sang-hee, Kim Ji-hyun, Sunwoo Yun-jae – stylists
- Hyeong Bae-hyung – album design
- Jo Se-hyun – photography
- Myungjin Art – printing
- SM Entertainment – executive producer
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