"B.U.T (BE-AU-TY) / Back to Tomorrow" is a double A-sided digital single released by South Korean pop duo Tohoshinki.

It was released on September 21, 2011 by Avex Trax as a pre-release single for their fifth Japanese album, Tone.

[2] On August 15, 2011, "Back to Tomorrow" was announced to be the theme song of a commercial for Menards ILLUNEIGE, a Japanese cosmetics brand.

On August 27, Tohoshinki released the official track list for Tone, which included "Back to Tomorrow" and "B.U.T," the album's pre-release lead single.

Tohoshinki debuted their first performance of "B.U.T" at the SM Town World Tour in Tokyo Dome on September 2, 2011.