GFriend – 回:Song Of The Sirens

Backing Vocals – Chendy
Backing Vocals – Umji
Backing Vocals – Eunha
Backing Vocals – Hannah Robinson
Backing Vocals – 전재희
Backing Vocals – Yuju
Bass, Programmed By [Computer Programming] – Frants
Bass, Programmed By [Computer Programming] – Pdogg
Keyboards, Guitar – Frants
Mastered By [Sterling Sound] – Chris Gehringer
Mixed By [The Ninja Beat Club - Assistant] – Bill Zimmerman (2)
Mixed By [The Ninja Beat Club] – Phil Tan
Piano, Directed By [Vocals], Edited By [Digial Editing], Recorded By [Dogg Bounce] – Pdogg
Producer – "Hitman"Bang
Producer – Frants
Producer – Pdogg
Written-By – 倪子岡
Written-By – 이스란
Written-By – "Hitman"Bang
Written-By – Chendy
Written-By – 구여름
Written-By – 김진
Written-By – Frants
Written-By – Eunha
Written-By – Pdogg
Written-By – 노주환
Written-By – Hannah Robinson
Written-By – 황현
Written-By – Yuju

Backing Vocals, Directed By [Vocals] – 김연서
Edited By [Digital Editing] – 전부연
Mastered By [821 Sound Mastering] – 권남우
Mixed By [CUBE Studio - Assistant] – 전부연
Mixed By [CUBE Studio] – 조씨아저씨
Producer – Alyssa Ayaka Ichinose
Programmed By [Computer Programming], Arranged By [Strings], Strings – Alyssa Ayaka Ichinose
Recorded By [Vibe Music Studio 606] – 곽정신
Recorded By [Vibe Music Studio 606] – 정모연
Written-By – Mi Sung
Written-By – 이스란
Written-By – "Hitman"Bang
Written-By – 김진
Written-By – Alyssa Ayaka Ichinose
Written-By – Mike Macdermid
Written-By – David Brant
Written-By – Umji
Written-By – Charlotte Churchman
Written-By – Yuju

Backing Vocals – Caroline Gustavsson
Backing Vocals – 김나연 (2)
Directed By [Vocals] – 이원종
Directed By [Vocals] – 노주환
Drum – 이원종
Edited By [Digital Editing] – 이원종
Keyboards – 최명희
Keyboards – 노주환
Mastered By [821 Sound Mastering] – 권남우
Mixed By [KoKo Sound Studio - Assistant] – 김준상
Mixed By [KoKo Sound Studio - Assistant] – 김경환
Mixed By [Koko Sound Studio] – 고현정
Piano, Arranged By [Strings] – 최명희
Producer – 이원종
Producer – 노주환
Recorded By [Vibe Music Studio 606] – 곽정신
Recorded By [Vibe Music Studio 606] – 정모연
Written-By – Steven Lee (5)
Written-By – Caroline Gustavsson
Written-By – 김키위
Written-By – 디오리
Written-By – 이원종
Written-By – 노주환

Backing Vocals – 김소현
Bass – 최훈
Directed By [Vocals] – 김연서
Edited By [Digital Editing] – 전부연
Guitar – 영
Keyboards, Arranged By [Strings] – 정호현
Mastered By [821 Sound Mastering] – 권남우
Mixed By [CUBE Studio - Assistant] – 전부연
Mixed By [CUBE Studio] – 조씨아저씨
Producer – 정호현
Recorded By [Vibe Music Studio 606] – 곽정신
Recorded By [Vibe Music Studio 606] – 정모연
Written-By – 정호현
Written-By – 조윤경
Written-By – 김연서
Written-By – Umji
Written-By – Eunha
Written-By – Valeria Del Prete
Written-By – Sophia Pae
Written-By – 손고은
Written-By – Yuju

Backing Vocals, Directed By [Vocals] – 김연서
Edited By [Digital Editing] – 이우민
Keyboards, Synth, Programmed By [Computer Programming] – Justin Robert Reinstein
Keyboards, Synth, Programmed By [Computer Programming] – 이우민
Mastered By [821 Sound Mastering] – 권남우
Mixed By [GLAB Studios] – 신봉원
Producer – Justin Robert Reinstein
Producer – 이우민
Recorded By [Vibe Music Studio 606] – 곽정신
Recorded By [Vibe Music Studio 606] – 정모연
Written-By – Justin Robert Reinstein
Written-By – 이우민
Written-By – 이스란
Written-By – Mayu Wakisaka

Arranged By [Strings] – 김바로
Backing Vocals – Eunha
Backing Vocals – Adora (6)
Edited By [Digital Editing] – Frants
Edited By [Digital Editing] – Summergal
Guitar – 영
Mastered By [821 Sound Mastering] – 권남우
Mixed By [KoKo Sound Studio - Assistant] – 김준상
Mixed By [KoKo Sound Studio - Assistant] – 김경환
Mixed By [KoKo Sound Studio] – 고현정
Piano, Keyboards, Bass, Directed By [Vocals] – Frants
Producer – Frants
Recorded By [Big Hit Studio] – 김초롱
Recorded By [Studio-T - Assistant] – 권석표
Recorded By [Studio-T] – 오성근
Strings – 융스트링
Written-By – "Hitman"Bang
Written-By – Frants