S.C. Code Ann. § 38-51-40: Written agreement required.

No administrator may act as such without a written agreement between the administrator and the insurer, and the written agreement must be retained as part of the official records of both the insurer and the administrator for the duration of the agreement and five years thereafter. The written agreement shall contain provisions which include the requirements of Sections 38-51-60 through 38-51-110, except insofar as those requirements do not apply to the functions performed by the administrator.

Where a policy is issued to a trustee, a copy of the trust agreement and any amendments thereto must be furnished to the insurer by the administrator and must be retained as part of the official records of both the insurer and the administrator for the duration of the policy and five years thereafter.