Singer Brian from the group Fly to the Sky congratulated TVXQ's longevity publicly on Twitter on December 27th.

He posted two pictures of himself and TVXQ on his Twitter with a caption that read, "Happy to have watched my lil' bros in concert on their 10th year anniversary! TVXQ forever!"

The picture features Brian in the middle with the two members of TVXQ on his left and right. Their smiling poses show just how close they are in real life.

Their fans responded with tweets such as "They look very close" and "I also congratulate TVXQ for their 10 year!"

Brian's latest TV exposure was on SBS's "Fashion King Korea". TVXQ revealed their teaser for their 10th year anniversary album "Tense".