"Heartbeat" is a song by South Korean boy band BTS, released on June 28, 2019, as the fourth and main single from and in tandem with the album BTS World: Original Soundtrack.
[1] A music video was released alongside the song.
[2] The song is described as having a "pop-rock melody" featuring the group's "dulcet vocals"[1] as well as lyrics about destiny, which were also called a "love letter" to the group's fans.
[3] The song was revealed in the game prior to the soundtrack's release, but players had to first reach mission 14 of the first chapter to listen to it.
[4] The music video was also released on June 28, featuring "fantasy-meets-reality visuals which sees all seven members on their own journeys".