1. The plaintiff's appeal against the defendant C shall be dismissed.

2. In the judgment of the court of first instance, the defendant C, D, E, and the Korea Telecommunication.

1. Basic facts

(a) Contracting agency and performance guarantee insurance contract 1) A (hereinafter “A”)

A) On June 1, 2009, between the Plaintiff’s Intervenor and the Plaintiff’s Intervenor, a consignment agency contract for the business, etc. of the goods and services of the Plaintiff’s Intervenor (hereinafter “instant consignment agency contract”).

Defendant G and H (Defendant G’s wife) entered into the instant consignment agency agreement

(2) On June 23, 2010, the Plaintiff and the insured Intervenor, the insured amount, KRW 550 million, and the insurance period from June 2, 2010 to June 1, 2012 (the former contract is renewed, and the obligation guarantee insurance contract (hereinafter referred to as the “instant guarantee insurance contract”) was issued by the Plaintiff on June 1, 2010, to guarantee the payment of the damages liability of each of the said Defendants and the amount of the credit goods to A based on the instant consignment agency contract, and to guarantee the payment of the amount of the credit goods to the Plaintiff.

3) The Plaintiff and A agreed to pay, under the instant guarantee insurance contract, the Plaintiff’s prior claim for reimbursement of the insurance amount from the insured, and under the agreement, A paid the Plaintiff the insurance amount and the damages for delay at the interest rate determined by the Plaintiff from the day following the day of the payment of the insurance amount to the day of full payment. Defendant C (Defendant E)

(i) D, the mother of Defendant E;

(A) is the actual operator of E(A).

)and K (Defendant E).

(2) On June 28, 2010, F, and B Co., Ltd. (Defendant E, the representative director, Defendant E, shall be liable for reimbursement, etc. against the Plaintiff under the instant guarantee insurance contract.