Group Super Junior's member Choi Siwon congratulated TVXQ's comeback.

Today, Choi Siwon posted on his Twitter, "Ah I laughed so much thanks to Changmin. My great senior singers but also my fellow singers TVXQ. Congratulations on your 10th year debut anniversary comeback" along with a picture.

In the picture, Choi Siwon is posing with TVXQ in the waiting room of SBS "Inkigayo" after TVXQ's comeback stage.

Internet users who saw this commented, "What royal friends," "Where are they looking?," etc.

TVXQ recently released their new song "Something."

Photo Credit: Choi Siwon Twitter