On December 10 KST, it was revealed that one of the staff members present at a pre-recording for the upcoming '2021 MAMA' had tested positive for COVID-19. As a result, Wanna One will be postponing the pre-recording for their reunion stage at the '2021 MAMA'. 

Below is Mnet's official statement:

"On December 10 KST, one of the staff members who had been present during the pre-recording rehearsal for the upcoming '2021 MAMA' was notified that they had tested positive for COVID-19. Following this news, the artists and staff immediately put a pause to the rehearsal, and all fans who were in line for the pre-recording stage have been asked to return home.

All staff members and artists who were present at the rehearsal plan to undergo the COVID-19 test. The rehearsal location has also been disinfected.

We will do our best to comply with current COVID-19 prevention measures and ensure that the event is conducted safely."