While we wait for the official music video, Mystic89 has treated fans to an the official audio for Park Ji Yoon's latest single, "Beep"!

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Although Park Ji Yoon has been promoting "Beep" on music shows this past weekend but now the song is officially available on music sites.

She's already released her pre-release track "Inner Space" (Korean title: "Brain Structure"). Both "Inner Space" and "Beep" were composed by Postino and written by the collaborative efforts of Park Ji Yoon herself and Yoon Jong Shin.  

Which song is your favorite, '"Beep" or "Inner Space"?