But unlike most BTS drops, the 544-page book became a bestseller before the subject matter was even revealed, thanks in large part to Taylor Swift fans. In May, a listing for “4C Untitled ...

others think it might be a BTS pop-up store to celebrate 10 years of the HYYH universe. Some have also pointed out that the teasers could be for the group's annual Festa. While there are many ...