tracks 1, 5, 6 arranged by David Campbell
tracks 12 arranged by 남정호
tracks 9, 10 arranged by 유희열
tracks 7, 8, 11-13 arranged by 이승환
tracks 2, 3 arranged by 정석원
tracks 9 arranged by 최진우
backing vocals Alex Brown
backing vocals Dorian Holley
backing vocals Kevin Dorsey
backing vocals Marlena Jeter
backing vocals Raven Kane
backing vocals Stephanie Spruill
backing vocals The Waters
bass Freddie Washington
bass Leland Sklar
cello Larry Corbett
coordinator 김주연
drums Ed Greene
drums John Robinson
engineer [assistant] Brandon Harris
engineer [assistant] Kyle Bess
engineer [assistant] Ross Hogarth
engineer [assistant] 김태하
engineer [assistant] 엄현우
graphic design 명진애드
guitar Dean Parks
guitar Michael Thompson
harp Amy Shulman
horns Bill Reichenbach
horns Dan Higgins
horns Gary Grant
horns Jerry Hey
mastered by Bernie Grundman
percussion M.B. Gordy
percussion Michael Fisher
photography by 안성진
piano, keyboards Greg Mathieson
piano, keyboards Jon Gilutin
piano, keyboards Randy Waldman
piano, keyboards 이승환
producer, orchestrated by, conductor David Campbell
programmed by 남정호
programmed by 유희열
programmed by 이승환
programmed by 최진우
recorded by, mixed by Gabe Veltri
recorded by, mixed by 노양수
recorded by, mixed by 이훈석
recorded by, mixed by 정석원
saxophone Eric Marienthal
strings The Hollywood Studio Symphony
synthesizer Claude Gaudette
Distributed By Seoul Records, Inc.
Recorded At Seoul Studio
Recorded At Lead Sound
Recorded At Daeyoung Studio
Recorded At Record Plant, Los Angeles
Recorded At Rumbo Recorders
Mixed At Seoul Studio
Mixed At Record Plant, Los Angeles
Mastered At Bernie Grundman Mastering
이승환의 도전정신과 재능이 잘 표현된 4집 앨범 ! 기존보다 한차원 높은 사운드를 들려준다. 그의 대표곡 '천일 동안' 이 수록되었다.