B1A4's CNU revealed to have suffered a knee injury.

According to the officials, CNU has damaged his knee cartilage and will be receiving surgery for it. Even though the injury was known even before the new album released last August, but he didn't want the plan to be pushed back because of him, showing his responsibility as the oldest member of the group

Regarding this matter, WM Entertainment said,"As he decided to proceed with the activities, he has been receiving regular treatment during promotions. We are planning for a surgery after B1A4's concerts".

Meanwhile, B1A4 will hold their solo concert 'B1A4 Advanture 2015' on September 12th and 13th at Yonsei University Amphitheater.