On November 10, a representative of Jellyfish Entertainment stated, "Yewon was in the hospital on November 9 to receive an operation for tympanitis (middle ear inflammation/infection). It is something Yewon has been dealing with, and the situation got worse recently, which led her to eventually go to the hospital. Currently, Yewon has been treated and is resting at home."
Hopefully, she gets well soon. Stay tuned for updates on Yewon's condition.