Nana might be leaving the cast of the upcoming drama 'Four Sons'.

SEE ALSO: Actress Lee Si Ah cast as Nana's replacement in 'Four Sons'

The drama series has had its share of production troubles, and Pledis Entertainment announced Nana will be leaving the cast. On August 23, the label stated, "The 'Four Sons' reps have sent Nana a notice announcing her termination from the cast. After that, the contract legally came to an end. We'll give you an update after we arrange things with our legal representative."

However, the 'Four Sons' producers have stated differently. The drama production announced filming would commence on August 27, adding, "We've paid the fees and continuously discussed with Nana's agency about re-starting filming, fulfilling our roles and duties." 

The production also stated Nana and Pledis Entertainment do not have the right to terminate her contract with unilateral evidence, and they expect Nana to appear at the screenplay reading on the 25th and filming on the 27th as the female lead of the drama.

Stay tuned for updates.