The song, which debuted at No. 4 on Oct. 25, climbed two spots, trailing only Gigi Perez's "Sailor Song." PSY's 2012 hit "Gangnam Style" remains the only K-pop song to have topped the U.K. chart.
"APT.," dropped Oct. 18, is a pre-release song from her upcoming debut solo album "rosie," due out in December.
The pop-punk track, inspired by a Korean drinking game, features a catchy chorus with repetitive chants of "apart, apart," a Korean abbreviation for "apartment."
The single has already reached No. 8 on Billboard's Hot 100. Its music video surpassed 200 million YouTube views within 11 days of release.
