1. The Defendant shall pay to the Plaintiff KRW 2,838,103,05 and KRW 2,673,638,330 among them, with full payment from December 20, 2017.

1. Basic facts

A. On December 29, 201, the Plaintiff entered into a subcontract with the Korea Water Resources Corporation to enter into a contract for construction works with the Korea Water Resources Corporation, under which the Plaintiff would be awarded a contract for the C business water-purification facilities (hereinafter “B water-purification facilities”) which installed the water-purification facilities (hereinafter “B water-purification facilities”). The B water-purification facilities were introduced when various organic substances accidents, such as high-level water-purification facilities using active carbon, are generated in the process of general water purification in order to treat agricultural products, organic chemicals, smells, smells, coloring, and ionculic agents, which are not removed by ordinary water purification methods.

This was included.

On May 13, 2015, the Plaintiff entered into a contract with the Defendant to enter into a subcontract with a total contract amount of KRW 2,817,054,240 (including value-added tax) and a contract to enter into between May 13, 2015 and July 2, 2016 (hereinafter “instant subcontract”).

The contents of the instant subcontract include the basic contract, the supply request (or the order), the specifications, the drawings, specifications, the general terms and conditions of the contract, and all documents related to the contract exchanged between the parties on the basis of these terms and conditions (Article 3 of the Basic Contract), and the main contents related to the quality of active coal to be delivered by the defendant are as follows:

Article 25 (Quality Guarantee) ① (Defendant) of the Basic Contract shall conform to the specifications presented by A (Plaintiff) for an object and secure quality and reliability as requested by A (Plaintiff).

Article 18 (Construction, etc.) (1) of the Special Conditions, "B" shall be the terms of this Agreement, design documents, specifications of construction, design drawings, and field description.