어린 여름날,

이룰 수 없었지만 찬란했던 첫사랑의 기억

‘긴 머리(Unforgettable)’

Lyrics by 박정근

Composed by 박정근

Arranged by 박정근

Acoustic Guitar by 김의주

Piano by 강상희

percussion by 윤두호

Cello by 이진영

Violin by 이선미