Peek-a-Boo (Red Velvet song)

An up-tempo dance-pop track with tropical house elements, it was written by Kenzie, Ellen Berg Tollbom, Cazzi Opeia, and duo Moonshine, while production was handled by the latter contributor.

"Peek-a-Boo" received generally positive reviews from critics, who noted the group's transition from a brighter and bubblier image from their last two singles "Rookie" and "Red Flavor" to a more mature sound.

[3] "Peek-a-Boo" was composed by Moonshine (Ludvig Evers & Jonatan Gusmark), Ellen Berg Tollbom and Swedish artist Cazzi Opeia, who revealed earlier in June 2017 that she had written a song for the group.

[8] To match the mysterious vibe of the music video, member Joy recorded her own laughter multiple times for a segment in the track but ultimately, the voice taken from the original demo was featured instead.

[10] Kyle Hanagami once again choreographed for the group, his fifth time working with them after "Be Natural" (2014), "Ice Cream Cake" (2015), "Russian Roulette" (2016) and their last single, "Red Flavor", which was released only months prior.

With a plot similar to b-grade horror films, it starts off with all five girls in rainbow dresses staring ominously at a full moon on the porch of an old house.

A pizza delivery boy is lured inside and tricked into playing with them, eating (for example) green jello off a plate while blindfolded, but after making a show of helping him escape the danger he realizes he is in, the five women hunt him down and the video ends with his uniform on display in a glass case that was last seen empty in the girls' house.

Lai Frances of PopCrush stated that "the K-pop quintet ditched the saturated sets for darker schemes while channeling their inner Wednesday Addams".

[12] The group's main vocalist Wendy admitted that she struggled to get into character as a "femme fatale" but fellow member Seulgi claimed that she liked the darker pop sound and eerie music video.

[16] Kookmin Ilbo praised all the songs in the album, calling them "colorful and solid" and characterized the single as "a combination of grooves by heavy drum beats and dark yet lively melodies".

[18] Tamar Herman of Billboard described the lead single as "a stylistic follow-up" to their 2015 song "Ice Cream Cake" which according to her had the same "haunting, chromatic melody and taunting choral hook".