S.C. Code Ann. § 9-21-40: Who may prosecute claim.

A claim brought pursuant to this chapter must be prosecuted by the member or the member's designated beneficiary, respectively, or by an attorney authorized by the member or the designated beneficiary, respectively. A member or member's designated beneficiary may not bring a claim under this chapter as a representative of any other member or any other member's designated beneficiary unless acting as the guardian ad litem for the real party in interest. A claim may not be prosecuted on behalf of a class.