In May 2011, U-KISS formally signed under Avex Japan for their Japanese debut. Soon thereafter, an album entitled First Kiss, a compilation of all their songs from their debut Korean album up until their Break Time album, was released. A Japanese version of their Korean Bran New Kiss albums and their DVDs from their First Kiss Live in Osaka event were also released. On June 8, 2011, U-KISS went to stay in Japan for three months to prepare for their official Japanese debut. On November 18, 2011 Japan’s Fuji TV Network revealed a preview for the music video of the lead single from U-KISS' first new material Japanese album, A Shared Dream, entitled "Tick Tack". On November 23, the full track of "Tick Tack" leaked online, and the full music video followed on December 5, 2011. U-KISS released the music video officially through their YouTube account on December 6, 2011. The song was released as a single, with the non-album B-side "Coincidence", on December 18, 2011.

The album has a total of twelve tracks, which were mostly composed and recorded in high quality facilities in Japan. U-KISS made their official Japanese debut on December 14 with a live performance of "Tick Tack" on the Japanese TV show, Made in BS Japan. "A Shared Dream" was leaked on the internet on February 16, 2012. It is a heavy ballad, with a mixture of English and Korean lyrics incorporated with piano. The single, "Forbidden Love" is a continuation of the style they had in "Man Man Ha Ni" (2008), "Bingeul Bingeul" (2010) and "Shut Up!" (2010). The group held a fanmeeting event with 2,000 fans to celebrate the release of their albums and the very first performance of "Forbidden Love". The song was also performed on the March 16th episode of NTV‘s Happy Music. U-KISS also promoted on various radio stations such as Skip Beat, KPOP Street and Area Cross of Northwave FM, Now & Next and Groove of Air-G FM and on STV Radio. Aside from Radio promotions, the group also appeared on shows like DJ and Play Saturday of TVh.

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