Group Super Junior's member Ryeowook gave a birthday message to Choi Siwon.

Today, Ryeowook posted on his Twitter, "Rib eye day. Siwon, happy birthday!!" along with a picture.

In the picture, Super Junior M members are at a BBQ restaurant. They were either holding up their cups or Vs, posing for the camera.

Internet users who saw this commented, "Happy birthday, Siwon," "His legal birthday is different from his actual birthday," and "He must be so happy to have all his members celebrate with him."

Super Junior M is currently working with their song "Swing".

Photo Credit: Ryeowook Twitter