The song was released 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).
Release and reception
"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]