Jaejoong has confirmed his title song as "Just Another Girl" for his first solo album.

On October 21, C-JeS Entertainment said, "The title track of Jaejoong's first solo studio album, "WWW: Who, When, Why", will be 'Just Another Girl' and the lyrics are written by Jaejoong himself. The song is post-grunge rock, and will have the mass appeal with the strong beat of hard rock, the exciting melody of punk, and the lyricism of Brit pop."  

The agency said, "The first music video teaser will be released on October 22."

Jaejoong's first solo studio album 'WWW: Who, When, Why' contains various genres including post-grunge rock, punk rock, and ballad. Many artists including Yoon Do-hyun, Glay's Takuro, Noel's Lee Sang-gon, Ha Dong-kyun, and B2ST's Yong Junhyung are featured on Jaejoong's album.

Previously, Jaejoong pre-released a ballad song 'A Sunny Day', which topped various music charts. He will be pre-releasing 'Butterfly' on 23rd. The singer will release his first solo studio album on 29th and hold his '2013 Kim Jae Joong 1st Album Asia Tour Concert' from November 2-3 at COEX, Seoul.