“Heartbeat” is a song by K-pop band 2PM. It was released on November 10, 2009, as the lead single for 01:59PM.
The song’s music video was released on November 11, 2009, the day after the song’s release. It features dark, moody visuals. The color palette is mostly blacks, greys, and whites. It is the band’s first music video to exclude Jaebeom, who left the band a few months before the video’s release.