Question: Sweet Girl is the sixth mini-album released by B1A4 under WM Entertainment, the  title song of the album, "Sweet Girl", along with the other songs, was produced by which South Korean singer, songwriter, record producer, and actor?
Sentence (from "Who Am I (B1A4 album)"): The album was released on January 13, 2014 by WM Entertainment and their distributing label Pony Canyon Korea.
Relevant evidence: No