is bad". In South Korea, writer Kim Sang-hwa of OhmyStar said the song received mixed reactions from the public but claimed that for those who follow the group and their music, this is normal for a Red Velvet release, that unpredictability is common for their title tracks and "RBB (Really Bad Boy)" is no exception. They added further that they're "controversial" because they're "unfamiliar", stating that they're welcome to those who are seeking something new. Commercial performance The song performed moderately at its home country. With only one day counted for charting, "RBB" debuted at number 26 on the Gaon Digital Chart for the 48th week chart issue before moving up to number 10 where it peaked the following week, thus giving the group their eleventh top-ten entry on the chart. In addition, the song debuted at number 22 and eventually reached its peak position at number seven on Billboard Kpop Hot 100, marking their fifth top-ten entry on the chart. "RBB" fared better on the US Billboard World Digital Song Sales nonetheless, as the song became their first to atop the chart thanks to a total sell of 2,000 downloads in the US in the week ending December 6. Elsewhere, "RBB" peaked at number ninety-three on the Japan Hot 100 chart. Credits and personnel Credits adapted from the liner notes of RBB. Studio Recorded at SM Blue Cup Studio Recorded and engineered for mix at SM LYVIN Studio Edited at doobdoob Studio Mixed at SM Yellow Tail Studio Personnel Red Velvet (Irene, Seulgi, Wendy, Joy, Yeri) – vocals, background vocals Kenzie – original writer, Korean songwriter, composition Sara Forsberg – original writer, English songwriter, composition, background vocals Timothy 'Bos' Bullock – original writer, composition,arrangement MZMC – original writer, composition Jeong Eui-seok – recording Lee Ji-hong – recording, mixing engineer Jang Woo-young – digital editing Koo Jong-pil – mixing Charts Weekly charts Release history References 2018 singles 2018 songs Korean-language songs Red Velvet (group) songs SM Entertainment singles Songs written by Kenzie (songwriter)