한여유 [나는 가끔 사랑이 무엇인지를 몰라]우리가 한 건 사랑이었을까그랬다면, 우린 왜 헤어졌고아니라면, 왜 아팠을까[CREDIT]Produced by 한여유Composed and Lyrics by 한여유Arranged by 김하연Piano by 박현서1st Violin by 장기윤2nd Violin by 문의현Viola by 심상우Cello by 오시민Recorded by 강해구, 박지연Mixed and Mastered by zivogy @zv studioArtwork by 추연주M/V directed by 추연주