The extended play features songwriting and production contributions from Sunwoo Jung-a, Hoody, Gray, and Heize.

[1] The release of Sandara Park was supported by the single "Festival", which heavily samples Uhm Jung-hwa's 1999 song of the same name from the album 005.1999.06.

[2] In February 2023, Sandara Park expressed via her social media accounts about working on her first solo album in South Korea.

She noted that the extended play would feature songs from various genres, highlighting her involvement in the album development process.

The announcement was accompanied by a teaser, which unveiled an amusement park-themed visual concept that plays on the singer's last name "Park".