smthblue의 첫 싱글앨범 [말해] [CREDIT] Lyrics by smthblue Composed by smthblue Arranged by smthblue Guitar by 홍서연 Vocal & Chorus by 효정 of CHIMMI MIDI Programming by smthblue Mixing by 이종명 Mastering by 소닉코리아 Recorded by NUPLAY