I noticed Hyunjin was having a hard time and struggling during District 9 esp, and kept touching his shoulders, but I only realized that he was actually in pain when I saw in a close up shot that both shoulders were heavily covered with plasters, the ones that are used to manage pain. I felt so bad for him that he had to dance the hard choreos while he was obviously in so much pain. 😔😪 But he still did great inspite of the pain !!! 👍👍👍👍