The song was released in South Korea on June 3, 2010, and was re-released under the title "Ko Go To" (コ・ゴ・ト) on December 14, 2011, as part of IU's first Japanese extended play I□U (2011).
"Nagging" is a popballad. The song was a commercial success in South Korea. The single debuted at twelve on the Gaon Digital Chart and shot up to number-one position the following week, where it remained for three weeks.[3]
^"아이유·임슬옹 '잔소리', '인기가요' 첫 1위" [IU and Lim Seulong's 'Nagging' wins first place on 'Inkigayo']. Star News (in Korean). Naver. June 27, 2010. Retrieved March 8, 2024.
2010년 Download Chart [2010 Gaon Download Chart] (in Korean). Gaon Music Chart. Archived from the original on October 18, 2013. Retrieved March 28, 2015.