It is the second track from the group's second Korean extended play Kill This Love, released on April 5, 2019.
It was written by Brian Lee and Teddy, who is also the producer of the song alongside 24, Bekuh Boom, and R. Tee.
Promoted as the EP's "subtitle track", Blackpink released a dance practice video for "Don't Know What to Do" and performed it on the music programs Show!
The group also promoted the song with performances at the Coachella Valley Music and Arts Festival in Indio, California on April 12 and 19, 2019.
[2] In South Korea, the song debuted at number 121 on the Gaon Digital Chart, later peaking at 38.