1. The Defendant shall pay to the Plaintiff KRW 684,382,592 and the interest rate of KRW 15% per annum from May 23, 2015 to the date of full payment.

1. The parties' assertion

A. A. Around January 2013, the Plaintiff’s actual operator, received F from the Defendant’s representative director via a director of D Co., Ltd. (hereinafter “D”), and thereafter, the Plaintiff began to engage in the transaction of receiving steel materials from the Defendant.

The Plaintiff, as indicated below, paid the Defendant the steel amount of KRW 1,272,865,020 in total nine times. However, the Defendant supplied only the steel amount of KRW 580,168,743, such as the stated “the amount supplied by the Defendant to the Plaintiff.” The Plaintiff received KRW 40,00,000 from the Defendant on March 20, 2013 and supplied KRW 41,686,315 to the Defendant on March 21, 2013. The Plaintiff received KRW 30,50,000 from the Defendant on February 27, 2013, supplied the Plaintiff with KRW 40,686,315 in total to the Plaintiff. The amount of KRW 10,000 from the above steel amount of KRW 10,000,000 to the Plaintiff, which was paid to the Plaintiff the amount of KRW 585,2858,208 (the total amount of the steel amount supplied to the Plaintiff).

The amount of steel materials supplied by the Plaintiff to the Plaintiff on the date of the sequence 80,00,00 of the amount of steel materials supplied by the Defendant to the Plaintiff is KRW 25,326,510 on January 31, 2013; and KRW 25,326,510 on March 4, 2013; KRW 59,541,339; KRW 306,600 on March 7, 2013; KRW 307,906, 300 on March 28, 2013; KRW 36,546,546; KRW 30 on March 13, 2013; KRW 40 on March 28, 2013; KRW 136,546; KRW 938,438 on April 13, 2013;