서툴었던 첫 설렘 [Credit] Lyrics by Imreu, 임석원 Composed by 임석원, Imreu Arranged by 임석원 Vocal by Imreu Chorus by Imreu, 임석원 Drum by 임석원 Bass by 임석원 E.Guitar by 임석원 Piano by 임석원 Mix & Mastered by 임석원