On July 16, ONF's agency WM Entertainment released a statement notifying fans of member MK's minor injury. 

In the statement, WM Entertainment notes that MK had sustained a minor ankle injury doing practice. While it is a minor injury, MK will still be attending the family concert 'RBW Summer Fes' that is to be held today (July 16), but with necessary arrangements to minimize movement. 

The full statement reads:

"Hello.
This is WM Entertainment.

ONF member MK has sustained a minor ankle injury during practice.

It will not affect his daily life but we are focusing on recovery as we have been told that it is better to avoid strenuous movements.

With that, MK will be participating in the RBW Family Concert scheduled for today. There will be minimized movement after discussions with MK.

We apologize for causing concern to our fans, and we will do our best to restore MK's health.

Thank you."

Wishing MK a speedy recovery.