On August 23, 2021, RBW announced that Purple Kiss will release their second extended play titled Hide & Seek on September 8, 2021, along with a logo motion teaser.[1][non-primary source needed] Later that day, the group's first concept photo was released.[2][non-primary source needed]
In addition, Zombie has been listed as one of 'The Best K-Pop Tracks of 2021' by Dazed. Dazed stated "Led by solid funk and disco influences, “Zombie” utilises an isolated electric guitar riff as a punchy transition, airy strings on the chorus, and plenty of bass to keep it at a pacey clip. On paper, it’s straightforward but this is merely a reliable base camp from which to scale to greater heights. Its secret weapon is two-fold – run riot with a visual mash-up of concepts (horror, girl crush, cute) and unleash Purple Kiss vocally." [4]