#Cookie Jar (Hashtag Cookie Jar) is the debut Japanese extended play and the sixth overall by South Korean girl group Red Velvet.

The extended play was then released on July 4, 2018, by Avex Trax and features a total of six Japanese tracks; containing three re-recorded versions of their previous hits – namely "Dumb Dumb", "Russian Roulette", and "Red Flavor", while also featuring three original Japanese tracks.

The first one is the First Press Limited Edition, which contains a CD, a 24-page booklet and a random photo card out of 6 types packed in a deluxe mini box packaging.

The second one is the Regular Edition, a jewel case that contains a CD, a 16-page booklet and a random photo card out of 6 types.

#Cookie Jar debuted and peaked at number 3 on Oricon's Weekly Album Chart, selling 26,124 physical copies.