2AM's Jo Kwon alarmed fans on December 29 with a Twitter update revealing that he was feeling under the weather--to put it lightly. �It appears the singer has caught a case of the Norovirus, a common yet still horrible form of gastroenteritis, right before the end of 2014.

He wrote, "Norovirus. �Last night was the most painful night of this year," and, "It never once avoids me even though I take care of myself and health well," with disappointment.

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Still, he has the support of fans, who responded with, "Don't be sick," "Get better quickly," "I hope you feel better soon," and more. �Feel better!