HummingBird [빈자리] ‘그리움 - 기다림 - 소중함’ [Credit] 01. 빈자리 (Feat. A.D) Produced by A.D Composed by A.D, HummingBird Lyrics by HummingBird, A.D Arranged by A.D Drum by A.D Synthesizer by A.D Chorus by A.D, HummingBird Mix & Mastering: Jibby Artwork: A9904