"Let It Go!" is a song by South Korean rock band F.T. Island. It is their fifth single under Warner Music Japan and eight single overall in Japan. The song was written by Kaji Katsura, Choi Minhwan and Lee Hongki, and composed by Corin and Choi Jong-hoon. It was released on July 27, 2011, in three editions: CD and DVD Type A, CD and DVD Type B and CD-only. The single debuted at number four on the Oricon weekly chart and at number six on the Billboard Japan Hot 100. "Let It Go!" went on to sell over 41,500 copies in Japan.