RBB is the upcoming fifth extended play (eighth overall) by South Korean girl group Red Velvet. It will be released on November 30, 2018 by SM Entertainment, with the lead single “RBB (Really Bad Boy)” and five other songs including an English version of the title track.
In August 2018, SM Entertainment has revealed their artist comeback plan for the second half of the year, with Red Velvet revealing to have two more album releases, the other titled Summer Magic. After Summer Magic’s release, news about Red Velvet’s upcoming comeback circulated in October 2018, which the group’s label SM Entertainment confirmed that Red Velvet would return in November with a new album but clarified that there was no set schedule. On November 9, 2018, SM Entertainment revealed the details of the EP along with the title of the lead single, “RBB (Really Bad Boy)”, and the release date.