“Peek-A-Boo” acts as a stylistic follow-up to the act’s 2015 hit “Ice Cream Cake,” overflowing with the same sort of haunting, chromatic melody and taunting choral hook. The new song is laden with trop house elements underneath the overarching quirky pop vibe, and is driven by a deep bass drumline, scratchy synths, and metallic beats. It features a variety of diverse, playful instrumental elements nestled beneath the main melody as the women sassily sing and rap about a new love that's like a teasing game that children play with one another.
The single was released with a music video overflowing with b-grade horror movie, Halloween vibes, not unlike what labelmates SHINee channeled in "Married to the Music" from 2015. Featuring the fivesome as serial murderers who have a thing for delivery boys, weaponry, sequins, and black magic, "Peek-A-Boo" features Red Velvet at their most seductive.
Beginning with a full moon bright in the sky as they stare at their prey in rainbow-hued outfits, the video shows the women tricking a pizza delivery boy into playing with them in their home before allowing him to escape, only to hunt him down again. The music video’s dance, performed in autumnal red outfits, features a peeping hand movement that’s not unlike the “OK” hand sign emoji as the women keep their eye on the object of their affection.
While “Peek-A-Boo” offers up an upbeat dance pop sound, Perfect Velvet overall explores Red Velvet’s expressive color through a variety of sonic styles: “Look” blends sultry nu-disco sounds with deep bass, “I Just” is a Hitchhiker-produced future bass dance track with dreamy harmonizing, “Kingdom Come” features an alt R&B sound with layered vocals from the quintet, and "My Second Date" is a midtempo pop track with contrasting elements ranging from dubstep beats to twinkling bell. Meanwhile, “Attaboy” turns the group towards hip hop with its 808 bass, though things slow down with the follow-up track, the smooth R&B throwback track “Perfect 10." The album ends with the rhythmic "About Love" and the mellow ballad “Midnight Melody.”
Watch the music video for “Peek-A-Boo” below: