“Film Out” was announced by BTS on February 16, 2021, as the ending theme for the Japanese movie Signal the Movie Cold Case Investigation Unit. The song was released on April 2, 2021.

“Film Out” became the group’s first Japanese-language song to chart on the Billboard Hot 100, at number 81, and its 20th entry on the ranking overall. With only one day of availability for the tracking week ending April 2, “Film Out” debuted at number 185 on the Billboard Global Excl. U.S. chart issue dated April 10, and moved up to number 3 in the second week. Film Out” debuted on the Billboard Global 200 at number five.

The song was written by BTS member Jungkook in collaboration with the lead vocalist of Japanese rock power trio Back Number, Iyori Shimizu, and the track’s producer UTA. “Film Out” was will be the opening track on BTS, the Best, slated for release in June 2021.