1. Blue Valentine
Lyrics by J14(Full8loom), Youra(Full8loom), danke, 국지원 (Jamfactory), 문설리, jellybean(153/Joombas), Milena, SEORA
Composed by KASS, Sevn Dayz, Stalking Gia
Arranged by KASS, 이해솔
Original Publisher FullBloom Music Publishing, Jamfactory, 153/Joombas Publishing, JYP Entertainment, Warner Chappell Music Limited, Warner - Tamerlane Publishing Corp
Sub-publisher CJ ENM, Sony Music Publishing, 153/Joombas Publishing, JYP Entertainment, Warner Chappell South Korea, Giatron Publishing (BMI)
Sessions
Computer programming by KASS, 이해솔
Piano by KASS
Electric Guitar by KASS, 이해솔
Synths by KASS
Bass by KASS
Background vocals by LILY, HAEWON, JIWOO, KYUJIN
Vocals directed by C’SA
Vocals edited by C’SA
Recorded by 이창훈, 김갑수, 엄세희 at JYPE Studios
Mixed by 이태섭 at JYPE Studios
Mastered by 권남우 @ 821 Sound Mastering
Mixed in Dolby Atmos by 신봉원 (Asst. 박남준) at GLAB Studios

2. Blue Valentine (English Ver.) (*Title)
Lyrics by J14(Full8loom), Youra(Full8loom), danke, 국지원 (Jamfactory), 문설리, jellybean(153/Joombas), Milena, SEORA
English Lyrics by Sophia Pae, 릴리
Composed by KASS, Sevn Dayz, Stalking Gia
Arranged by KASS, 이해솔
Original Publisher FullBloom Music Publishing, Jamfactory, 153/Joombas Publishing, JYP Entertainment, Warner Chappell Music Limited, Warner - Tamerlane Publishing Corp
Sub-publisher CJ ENM, Sony Music Publishing, 153/Joombas Publishing, JYP Entertainment, Warner Chappell South Korea, Giatron Publishing (BMI)
Sessions
Computer programming by KASS, 이해솔
Piano by KASS
Electric Guitar by KASS, 이해솔
Synths by KASS
Bass by KASS
Background vocals by LILY, HAEWON, JIWOO, KYUJIN
Vocals directed by C’SA
Vocals edited by C’SA
Recorded by 이창훈, 김갑수, 엄세희 at JYPE Studios
Mixed by 이태섭 at JYPE Studios
Mastered by 권남우 @ 821 Sound Mastering


3. Blue Valentine (A Cappella Ver.)
Lyrics by J14(Full8loom), Youra(Full8loom), danke, 국지원 (Jamfactory), 문설리, jellybean(153/Joombas), Milena, SEORA
Composed by KASS, Sevn Dayz, Stalking Gia
Arranged by KASS, 이해솔
Original Publisher FullBloom Music Publishing, Jamfactory, 153/Joombas Publishing, JYP Entertainment, Warner Chappell Music Limited, Warner - Tamerlane Publishing Corp
Sub-publisher CJ ENM, Sony Music Publishing, 153/Joombas Publishing, JYP Entertainment, Warner Chappell South Korea, Giatron Publishing (BMI)
Sessions
Background vocals by LILY, HAEWON, JIWOO, KYUJIN
Vocals directed by C’SA
Vocals edited by C’SA
Recorded by 이창훈, 김갑수, 엄세희 at JYPE Studios
Mixed by 이태섭 at JYPE Studios
Mastered by 권남우 @ 821 Sound Mastering


4. Blue Valentine (Sped Up Ver.)
Lyrics by J14(Full8loom), Youra(Full8loom), danke, 국지원 (Jamfactory), 문설리, jellybean(153/Joombas), Milena, SEORA
Composed by KASS, Sevn Dayz, Stalking Gia
Arranged by KASS, 이해솔
Original Publisher FullBloom Music Publishing, Jamfactory, 153/Joombas Publishing, JYP Entertainment, Warner Chappell Music Limited, Warner - Tamerlane Publishing Corp
Sub-publisher CJ ENM, Sony Music Publishing, 153/Joombas Publishi