“Mono by RM has surpassed 400 million streams on Spotify. It is his second released on October 23, 2018. The mixtape includes a track with production by Honne, features the South Korean indie rock band Nell and singer. It features seven tracks and was accompanied by an animated music video for the final track, “Forever Rain” RM has called Mono a playlist. Mono is RM’s second mixtape, following the release of his 2015 self-titled RM.