Real+

"Real+" is mini plus album by South Korean singer-songwriter IU. It was released as a single album, titled Real+ and distributed by LOEN Entertainment on February 17, 2011. The single, a follow-up to Real (2010), consists of three tracks in total. One song in the album, "Only I Didn't Know", appears twice – the second time as a collaboration piece with pianist Kim Gwang-min.

Background and release
The music video for the lead track, "Only I Didn't Know", features actress Park Bo-young as she is caught in a dramatic break-up story. Her ex-lover is played by singer-songwriter Yoon Sang, who also composed this piece as a gift for IU. The music video was released on the same day as the album.

The song itself is a departure from the pop-like sounds of her previously promoted song, "Good Day". It features a mature combination of IU's striking high notes, vocals and orchestral instrumentation.

IU made her promotional comeback with "Only I Didn't Know" in the television show Music Bank (KBS) on February 18, 2011, two days after the album's release.

As of 2011, the album sold over 23,500 copies in South Korea.

Track listing

 * Notes
 * The titles of both tracks 1 and 3 literally mean "Only I Didn't Know".
 * Track 3 is a piano version of "Only I Didn't Know".

Cover versions

 * South Korean singer Lee Eun-mi covered "Only I Didn't Know" on the singing competition program I Am a Singer.
 * South Korean singer K.Will covered "Only I Didn't Know" on Mnet's singing competition show Singer Game.