South Korean girl group Mamamoo is giving a glimpse of their new music video.The K-pop stars released a preview Tuesday of their video for the song "Mumumumuch."The teaser shows the members of Mamamoo enjoy a slumber party at a resort. The members are seen eating popcorn in bed, giving a toast and hanging out by the pool."Mumumumuch" is a new single that will appear on Mamamoo's forthcoming compilation album, I Say Mamamoo: The Best. The group will release the album and the full "Mumumumuch" video Wednesday.I Say Mamamoo: The Best will feature 21 of the group's hit songs and B-sides, along with two new singles, "Mumumumuch" and "I Still Believe."I Say Mamamoo: The Best will mark Mamamoo's first release since the EP WAW in June.Mamamoo consists of Solar, Moonbyul, Wheein and Hwasa. The group made its debut in 2014 and is known for the singles "You're the Best," "Decalcomanie," "Yes I Am" and "Starry Night."