t's not rumor mill but off the record, this article written by an Korean media outlet which fans might be familiar much through event press photos, it's the Mk star news, it was public on Naver, Navte and Daum last month too.
Although rumor mill and off the record were similar but of the record had the percentage of truth higher much since mostly of off the record articles were turned out to be truth, because it started from the mouths of the insiders in the industry as staffs, managers, stylists, ect. Even Dispatch said on an interview that they mostly started stalking to find out the celebrities's relationships based on "off the record" stories which they heard from those insders' chatting at workplace or hair salons but rarely from the fandoms since fans often tend to protect their stars' image, and Dispatch also said that the results came out to be truth even came to 95%.
The blind items which was translated a bit by a member on that OH: