RBB is the fifth Korean extended play (eighth overall) by South Korean girl group Red Velvet. It was 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.
The album was a commercial success overseas, with RBB and its lead single debuting atop Billboard's Top Heatseekers Album chart and World Digital Songs chart for the first time. The EP became the group's fourth consecutive album to earn a new best sales week in the United States. RBB also charted in France, Japan and the United Kingdom. It received generally positive reviews from critics who praised all of the album's tracks, with Caitlin Kelley of Forbes noting that all of the songs on the album "are strong enough to stand on their own".Conversely, "RBB (Really Bad Boy)" received mixed reactions from the public in South Korea. Despite this, the song peaked at number 10 on South Korea's Gaon Digital Chart and at number 5 on the Gaon Download Chart. Its parent album also debuted at number 3 on the Weekly Gaon Album Chart upon its release and charted at number 8 on the Monthly Gaon Album Chart with only a day to garner points to enter it.
- RBB (Really Bad Boy)
- So Good
- Sassy Me
- RBB (Really Bad Boy) [English Version]