Square Up

Square Up is the first Korean extended play (second overall) by South Korean girl group Blackpink. It was released on June 15, 2018 by YG Entertainment. The EP is available in two physical versions and contains four tracks, with "Ddu-Du Ddu-Du" released as the lead single. The song peaked at number one in South Korea for three weeks and became the highest-charting song by a female K-pop act in the United States and United Kingdom at the time. The track "Forever Young" was later promoted on Korean music programs and peaked at number two in South Korea.

Upon its release, Square Up debuted atop the Gaon Album Chart and went on to sell almost 179,000 copies in its first fifteen days of availability in South Korea. The EP also debuted at number 40 on the US Billboard 200, becoming Blackpink's highest selling album in a Western market as well as the highest-charting album by a female K-pop group. It was certified platinum by the Korea Music Content Association (KMCA) in March 2019 for selling 250,000 units, and was later certified double platinum in March 2023 for selling 500,000 units.