Update (June 24, 11:40pm EDT): An SM Entertainment spokesman tells IdolWow!, "No decision has been made yet regarding Sulli's future with f(x)."
Adds a source at the company, "Sulli hasn't officially left the group yet. This story came out too early."
(June 24, 9:30pm EDT): Has the music finished for Sulli? Reports in Korea are claiming that the singer has left f(x) to become a full time actress.
Popular tabloid Review Star writes, "According to multiple parties, Sulli will stop her activities with f(x) and become a fully-fledged actress."
The outlet goes on to claim that although Sulli's contract with SM Entertainment will soon expire, the 21-year-old will continue her relationship with the agency and renew their agreement.
Sources tell the publication that despite her departure, the group will continue as a four with Amber, Krystal, Luna and Victoria, when they release new music in the fall.
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When approached by IdolWow! for comment, an SM rep responded, "We are currently checking the validity of these reports and will release a statement shortly."
Although she is best known as a K-pop star, Sulli actually debuted as an actress when she was just 11-years-old, starring in the 2005 hit drama Ballad of Seo Dong, playing a young princess.
While promoting 2014 movie Pirate, Sulli said of being on the big screen, "I put everything in to my acting. There is so much I want to learn."