Don't Know What to Do (Blackpink song)

"Don't Know What to Do" is a song recorded by South Korean girl group Blackpink. 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! Music Core and Inkigayo in South Korea. The song debuted in the national charts of several countries, entering the top five in Malaysia and the top ten on the Billboard K-pop Hot 100. It has since been certified gold by the Australian Recording Industry Association.

Promotion
As the "subtitle track" of the EP Kill This Love, Blackpink performed "Don't Know What to Do" alongside the main title track "Kill This Love" on several music programs in South Korea including Inkigayo. 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.

Commercial performance
In South Korea, the song debuted at number 121 on the Gaon Digital Chart, later peaking at 38. In Japan, it debuted at number 49 on the Japan Hot 100.