On July 31, 2013, Ren posted a picture of himself on Twitter in the recording booth and wrote, "By.

"[1] Then on August 5, Pledis Entertainment confirmed that Nu'est was working with Duble Sidekick for their new comeback.

[4] On August 15, 2013, Nu'est released the intro rap video for their upcoming comeback.

[5] On August 19, they released the teaser for their upcoming comeback Sleep Talk onto their official YouTube channel.

[11][12] The EP entered at number 15 on the chart for the month of August 2013, with 11,935 physical copies sold.