진심 : 거짓이 없는 참된 마음 ‘이 진심을 어떠한 말로 어떻게 전해야 할지 모르는 나 같은 사람들을 위해’ -케이시(Kassy) [Credit] Composed by 조영수 Lyrics by 케이시(Kassy) Arranged by 조영수, 한길 Chorus by 케이시(Kassy) Piano by 조영수 Keyboard by 한길 Drum by 강수호 Bass by 신현권 Guitar by 정수완 String by 융스트링 String Arranged by 신민 Recorded by 나수민 @ Rui Studio Mixed by 최재영 @ Velvet Studio Mastered by 권남우 @ 821 Sound Mastering Executive Producer 남규석 Music Producer 조영수 Artist Management 이재진 Planning & Marketing 허채원, 안연주 Administration 허채원 Media public relation @ HNS HQ Artwork & Design 리제, 케이시(Kassy)