The song was commercially successful, becoming the group's fourth chart-topper on the Gaon Download Chart and their fourth number two entry on the Gaon Digital Chart.
Dazed also included the song in their '20 best K-pop songs of 2018'. It was included in Billboard's '100 Best Songs of 2018: Critics' Picks' list, and topped their annual '20 Best K-pop Songs of 2018: Critics' Picks' list, thus becoming the first female act to top this list. 'Bad Boy' was well received by critics in South Korea and overseas, who praised its 'pristine' production and the group's 'lush contemporary R&B-meets-pop' sound. The hip hop-influenced R&B and trap song was produced by production team The Stereotypes, Maxx Song, Whitney Phillips and Yoo Young-jin, while the Korean lyrics were adapted by lyricists JQ and Moon Hee-yeon.
' Bad Boy' is a song recorded by South Korean girl group Red Velvet, serve as the single from The Perfect Red Velvet, a reissue of their second studio album Perfect Velvet.
