"Apink Kim Nam-Joo will release a single album on September 7 and make a surprise solo debut," her agency PlayM Entertainment said on the morning of the 18th.

Kim Nam-Joo debuted in 2011 as a member of Apink, who has established herself as a leading K-pop girl group for 10 years, and has made a number of hit songs, including "FIVE," "LUV," "Mr. Chu," and "NoNoNo," and has been successful from "I'm So Sick" to "Dumhdurum," which dominated the music charts.

In particular, Kim Nam-Joo's solo debut is drawing more attention through collaboration with So-yeon of the group (G)I-DLE.