Super Junior's Kim Heechul uploaded a friendship photo of himself with�f(x)'s Sulli on October 25th, along with a very sweet tweet. He wrote,�"My 'sibling' Sulli came all the way to China despite her busy schedule! She always does her best in anything, and is full of loyalty. She may look like a little child, but she is a thoughtful dongseng." The photo was taken on the 23rd during �'Super Junior's Asia Tour Beijing Concert,' where� Sulli made an appearance during Heechul's solo performance. Netizens who have seen this photo have commented, "Heechul and Sulli seem like siblings", "They look good together", and�"Cute couple". Source + Photo: Heechul's official Twitter