A. On September 23, 2013, the Plaintiff and the Defendant entered into a contract with the Plaintiff for the production, supply, and installation of a MCC panel (hereinafter “instant construction”) with respect to the construction of an integrative plant (hereinafter “the instant prime contract”) with the Defendant, a company aimed at manufacturing and selling electric power machinery and appliances (hereinafter “the instant construction”) (the Defendant was awarded a subcontract for the said electrical construction in the instant factory through Sgr engineering, Sgr engineering, Skrmo system Co., Ltd. and re-subcontract the instant construction to the Plaintiff), and the main contents of the instant contract related to the instant case are as follows.

Terms of contract: From September 23, 2013 to October 15, 2013 (Provided, That the payment period corresponding to the schedule of on-site completion): 357,500,000 won (including value-added tax; hereinafter the same shall apply): Advance KRW 2 million; progress payment of KRW 26,600,000: The payment period of KRW 71.5 million; the remainder of 7.5 million (after the completion of a trial operation); The payment period of the goods: The payment of the goods at the time of completion of the examination by the Defendant’s person in charge;

The plaintiff is prohibited from entering into a subcontract without the defendant's consent.

B. On November 29, 2013, the Plaintiff was ordered by the Defendant to change the existing panel’s materials with regard to the instant construction work as the construction cost of KRW 39,60,000 and November 20, 2013.

(hereinafter referred to as “instant primary contract”). C.

Finally, around December 30, 2013, the Plaintiff received an order from the Defendant for work on the LOP site and additional materials related to the instant construction project, and submitted a written estimate (Evidence 4-1) to the Defendant to cover KRW 15,510,000 (excluding value-added tax) for construction and goods.

(hereinafter “instant secondary contract”). D.

The Plaintiff completed the instant construction in accordance with the instant original contract and each additional contract, and performed the supplementary work requested by the Defendant, and thereafter, D from the Defendant’s site manager D on April 22, 2014.