STAYC's Isa will be taking a break from all activities due to health issues.
On October 28, High Up Entertainment announced that Isa had been diagnosed with both COVID-19 and H1N1 influenza. To focus on rest and recovery, Isa will temporarily suspend all scheduled group activities.

The following is the full statement released by the company:
Dear all,
This is High Up Entertainment.
Due to the deterioration of Isa's health caused by the combined effects of COVID-19 and H1N1 influenza, STAYC member Isa will be unable to participate in all scheduled activities today.
Currently, Isa is focusing on treatment and recovery as advised by her doctor. We will continue to monitor her health and decide on her future activities.
We sincerely apologize for the concern felt by Swiss (STAYC fans) who were looking forward to Isa's performance due to her suspension of activities, and we will do everything we can to help Isa recover as soon as possible.
Thank you.

