Music video
"Keep Your Head Down" (2011)	"Before U Go" (2011)	"Superstar" (2011)
"Before U Go" on YouTube "Before U Go" (Full version) on YouTube "Before U Go" (Dance version) on YouTube

Before U Go (Hangul: 이것만은 알고 가; "just know this before you go") is the repackage of Keep Your Head Down (2011), the fifth Korean studio album by South Korean pop duo TVXQ. It was released on March 16, 2011 by S.M. Entertainment, two months after the original record. The repackage features three new tracks, all of which are remixes of the album's only lead single, "Before U Go." The single is produced by TVXQ's frequent collaborator Yoo Young-jin, who also produced their fifth album lead single "Keep Your Head Down".

Before U Go debuted at number one on South Korea's Gaon Albums Chart and the Hanteo Chart, boosting the sales for the original album, Keep Your Head Down. The lead single, "Before U Go", peaked at number thirteen on the Gaon Singles Chart and number one on various online music charts, receiving generally positive reviews from music critics. The single also won number-one trophies on music programs The Music Trend and Music Bank.

Their first album as a duo, Keep Your Head Down was released in January 2011. U-Know Yunho and Max Changmin recorded the album between 2009 and 2010, and had to re-record some tracks after their split.Keep Your Head Down was a commercial success upon its release, peaking at number one on the Gaon Albums Chart and maintained that position for two weeks. The album also peaked at number one on the Hanteo Chart, Hot Tracks, and number four on Media Traffic's United World Chart, a chart that compiles sales from the US Billboard, the Japan Oricon, and the UK Albums Chart.Keep Your Head Down received generally positive reviews from music critics and had nearly 240,000 shipments by mid-year, winning Gaon's Album of the Year award for the first quarter of 2011.

...
Wikipedia