Her agency, Core Contents Media, said in a statement, “Ji Yeon hurt her knee during dance practice and went to the hospital after filming for ‘M!Countdown’.” According the agency, to accommodate Ji Yeon’s knee troubles, the group chose to sit down for their pre-recorded performance.
At the hospital, Ji Yeon was diagnosed with Knee Synovitis, an inflammation in the area around the joints. She received treatment and went back to “M!Countdown” for the live show. It was then reported that Ji Yeon went back to the hospital to receive acupuncture.