Seventeen has officially begun the countdown to their comeback with the 11th mini-album 'Seventeenth Heaven' and released the teaser schedule chart.

According to the chart released on September 21 at midnight KST, the group will begin releasing teasers on September 23. The group has a handful of teasers in store to reveal the concept of the upcoming mini-album.

The 11th mini-album 'Seventeenth Heaven' will be released on October 23 at 6 PM KST! So mark your calendars, and don't miss out on any teasers!