MAMAMOO is revealing more information about their new mini-album in an interesting and fun way.

On September 29 at midnight KST, MAMAMOO released a spoiler clip showing a group chat between the group and staff members. In the chat, the design team shared a file that is labeled "Confidential," and MAMAMOO expressed their concern saying, "It's not all revealed yet..." The teaser clip announced that there will be a continuation released at  6 PM KST.

Meanwhile, MAMAMOO will make their comeback as a whole group on October 11 with a brand new mini-album.