SM Entertainment was revealed to be preparing documents to take strong legal action against those spreading malicious rumors about f(x)'s Sulli.  

It was revealed near the end of March that Sulli had been treated in the emergency room after complaining of a stomachache induced by stress. Afterwards, a couple of netizens produced malicious rumors regarding the reason behind her stomachache.

In addition, one screenshot of KakaoTalk that said, "My friend works at that hospital and my friend says that the reason Sulli is now in the emergency room is because of XXXXX," began to circulate, as well.

SEE ALSO: f(x)'s Sulli belatedly revealed to have been sent to emergency room for abdominal pain

On April 2, one administrator of Sulli's fan page wrote through SNS, "SM Entertainment is in the middle of acquiring documents relating to Sulli's harassment.  The attorney says the more documents the better, so asked to send them all.  The people who spread those rumors should be prepared," and attached a screenshot of what appeared to be proof of the widespread circulation of the rumors on the internet and gathering of evidence.