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"Bad Boy" is a song by South Korean girl group Red Velvet, released as a single from The Perfect Red Velvet, the reissue of Perfect Velvet (2017). It was released by S.M. Entertainment on January 29, 2018, along with the album and an accompanying music video. Written by S.M. Entertainment artist and songwriter Yoo Young-jin and produced by The Stereotypes, Maxx Song and Whitney Philips, "Bad Boy" is primarily an R&B song with elements of hip hop that has a synth melody and heavy bass sound. Its lyrics describe a relationship between the titular "bad boy" and a cold woman