The November 20 broadcast of SBS Radio Power FM's 'Lee Kuk Ju's Young Street' welcomed Red Velvet to the show.

In regards to their comeback with "Peek-A-Boo" the girls commented, "We worked hard to portray a mature and advanced image. We wanted to present something new and show a different side of us."

As for the music video for "Peek-A-Boo," they stated, "It has some horror elements to it. We wanted to illustrate a mysterious vibe." Joy described how she recorded her own voice for the laughing voiceover. "I had to record my own laughing sound numerous times but the actual MV features the voice taken from the original demo. I think they decided to edit out my voice because it was too high-pitched."

How are you enjoying their latest concept?