Written and composed by Park, it was released as a digital single on August 12, 2020 by JYP Entertainment.

Park when Wonder Girls were touring the United States with him, Sunmi sent a recording of the song to her former boss to reminisce about the past.

Park answered her message by sending her a demo of his song, asking her "if she missed the days [they] worked together" and suggesting a collaboration.

[8] Park said to have used "typical instruments of the European disco genre and recorded with the equipment imbued with 80s vibes to fully recreate nostalgic melody.

[10] It was inspired by the American films Saturday Night Fever (1977) and Pulp Fiction (1994) which J. Y.

[11] Riddhi Chakraborty of Rolling Stone India described the music video to have "a late-Seventies, early-Eighties vibe, reviving the Saturday Night Fever era with its multi-coloured dance floor, hazy club setting, glimmering disco ball and glitzy wardrobe and makeup.

Park and Sunmi play lovers who are parted in their youth but are fated to meet again 10 years later, fighting gangsters and all odds to be together and celebrate their love for each other and for disco.