Unlike her previous works, A Flower Bookmark features cover versions of nostalgic K-pop songs popularized from 1980s to 1990s.

[8] The teaser features Kim Wan-sun, the original singer of "Pierrot Smiles at Us" (Korean: 삐에로는 우릴 보고 웃지; RR: Ppieroneun Uril Bogo Utji).

[9] The official music video for the title track "My Old Story" (Korean: 나의 옛날 이야기; RR: Naui Yetnal Iyagi), starring actor Choi Woo-shik, was released via YouTube on the same day.

The Korea Herald complimented the album for providing "a pleasant, calming respite from the mainstream music of today's times", and praised IU for her reinterpretations: "For every track, IU keeps a careful balance between preserving the song's original sentiments and altering the original with her own color and arrangements.

"[14] Billboard highlighted the track, "Pierrot Smiles at Us" (Korean: 삐에로는 우릴 보고 웃지), as the "most ambitious tune she tackled" and one that proved her diversity as a singer and called the album a "soothing mix of classic K-pop melodies".