Shy Boy is Secret's first Japanese EP and third overall. Released on November 16, 2011, it contains six songs. All songs are remakes of Secret's Korean songs including "Shy Boy" and "Starlight Moonlight".
The plans of "Shy Boy" as Secret's second Japanese single was first announced on August 28, 2011. On September 28, 2011, teasers for the "Shy Boy" music video was released. The official music video was revealed on October 8, 2011. On November 8, 2011, the official music video for "Christmas Magic", a remake of "Starlight Moonlight" with a new Christmas beat was unveiled. The EP was released to music stores on November 16, 2011.
On November 22, 2011, it was announced that a Christmas Edition of the album will be released to music stores on December 7, 2011. The album cover is themed after Christmas, with Secret wearing clothing resembling Santa Claus.