On December 26, a representative revealed, "Heize was taken to the hospital early in the morning and is currently hospitalized.�She had symptoms of sinusitis and wasn't treated properly in time, leading to further complications. A surgery has been scheduled."

SEE ALSO: Singer-songwriter Paul Kim to marry girlfriend of 9 years

The representative also shared, "It will be difficult for her to resume her scheduled activities during this time."

A day earlier on December 25 at '2017 SBS Gayo Daejun', Heize fainted after her collaboration stage with Lee Juk�from a high fever and nausea and was rushed to the hospital.�