A. On January 20, 2015, the Plaintiff entered into a credit guarantee agreement with B (Name C) on January 20, 2015, and paid KRW 72,00,00 to B, and the credit guarantee agreement with D Bank on January 20, 2016 (which shall be extended to July 18, 2019). According to the credit guarantee agreement of this case, when the Plaintiff performed the above guaranteed obligation, the principal obligor and joint guarantor agreed to pay the Plaintiff all incidental obligations, such as the amount subrogated by the Plaintiff and the interest rate fixed by the Plaintiff from the date of repayment to the date of payment, and the expenses paid by the Plaintiff during the period of 20% until the date of payment, and the interest rate of KRW 10,00,00,00,00, and KRW 20,000,000 as collateral, the Defendant lost its principal and interest rate of KRW 70,506,000,000 for each of the above guaranteed obligation to the Plaintiff.