On March 1 Fantagio released a statement on ASTRO’s official fan cafe on March 1 informing fans that Cha Eun Woo will be taking a break temporarily from activities.
Here is their official statement:

“Hello. This is Fantagio.
“Due to ASTRO’s Cha Eun Woo having sudden cold symptoms, he will not be joining any activities and will be resting today.
“Right after the concert in Taiwan yesterday, Cha Eun Woo’s condition deteriorated and he had cold symptoms, so we urgently went to a hospital to get treatment. At present,,his condition has improved greatly but we have to follow the doctor’s suggestion that he needs to rest one more day. He will not be participating ASTRO’s schedules today in order to focus on his health and recovery. We sincerely apologize to fans in Taiwan who have waited a long time for ASTRO.

“We are informing AROHA of this news out of concern so that you will get upset about Cha Eun Woo’s health.

“We also apologize for making fans worry and will try to do our best to focus on his health and treatment in order for him to have a speedy recovery for him to participate in the remaining activities.

“Thank you.”

We hope Cha Eun Woo feels better soon!