yeah he was wearing a knee brace during wolf/growl promos bc of the choreo being hard on his knees iirc. he’s talked about the injury during a visit to jonghyun’s radio show years ago and during a recent one, and how it had him out of commission for almost a year and that’s why he channeled his energy towards acting and getting into k-arts at the time. kai once talked about having to carry suho on his back too out of the practice rooms too so that might’ve been around that time since suho never stopped training even then, especially after his brother talked to him about not just idling and still finding some way to keep training