MLD Ent. relayed, "Yeonwoo is currently receiving treatment at the hospital after experience sudden high fever. She is also showing signs of a throat infection and her immune system is very weakened, so we plan to have her rest for some time. Yeonwoo will not be attending Momoland's schedules for the next few days in order to focus on regaining her health."
Meanwhile, Momoland will be attending the '2018 MBC Plus x Genie Music Awards' ceremony on the evening of November 6, before they leave for their Japanese promotions on November 7.
Get well soon, Yeonwoo!