1. The defendant is the defendant's 351,621,600 won against the plaintiff Hos Construction Co., Ltd., the plaintiff Geumho Industrial Co., Ltd., and the defendant corporation.

1. Basic facts

A. 1) The Defendant entered into a construction contract with the Public Procurement Service to build a government office building 2-1 (hereinafter “instant construction”) at Sejong City Government Office (hereinafter “instant construction”).

2) The plaintiffs were publicly announced to tender 30.3 of the Act on Contracts to Which the State is a Party. The plaintiffs were to jointly supply and demand the instant construction works, and the representative contractor of the joint supply and demand company was designated as the successful bidder. The plaintiffs' share ratio is 40% of the Plaintiff SP Co., Ltd., 18% of the construction works, 18% of the Plaintiff SPP Co., Ltd, 18% of the construction works, 18% of Tae Young Young Co., Ltd., 18, and 6% of the construction works of the Plaintiff Co., Ltd., 10, 00,000,000,000 on November 18, 201, 201, 30.36% of the contract amount of the construction works, 178,795,000,000 won on the date of completion, 20.3% of the construction works, 16.18% of the total construction contract on the date of commencement.

B. On November 5, 2013, the Plaintiffs, including the Plaintiffs’ request for the increase in the construction cost, requested the Defendant to change the design regarding the instant construction project, and requested the Defendant to increase the contract amount of KRW 12,409,740,000 in accordance with the Defendant’s direction. The Defendant recognized only the increase in the contract amount of KRW 3,042,00,000 on November 15, 2013.

Therefore, although the plaintiffs filed an objection against the change of design, the defendant shall place an order among the reasons for requesting the increase.