2. The plaintiffs added to this court.

A. 1) The Public Procurement Service around October 6, 2008 (hereinafter “instant construction”) shall construct G in the E complex F zone (hereinafter “instant construction”).

(2) As to the Plaintiff, the Plaintiff organized the joint supply and demand (the share ratio: 50%, Plaintiff B Co., Ltd., 30%, Plaintiff C Co., Ltd., 20%, Plaintiff C Co., Ltd. (the name of the Plaintiff Co., Ltd. prior to the change), and the Plaintiff Co., Ltd. (the name of the Plaintiff Co., Ltd. was omitted), and participated in the said tender and was selected as the successful bidder of the instant construction project.

3) On April 3, 2009, the Public Procurement Service entered into a single unit contract (the contract amount of KRW 5,391,283,04, construction period from April 3, 2009 to August 31, 2009) with the Plaintiffs and the instant construction in the form of a long-term long-term contract with respect to the instant construction project, stating the total construction cost of KRW 149,457,00,000 and the total construction period of KRW 1,050 from April 3, 2009 to February 17, 2012 (the contract amount of KRW 5,391,283,04, construction period of KRW 150 from April 3, 2009 to August 31, 209) (hereinafter referred to as the “instant contract,” and each of the instant contracts “the instant general contract,” and each of the instant contracts “the instant number of contracts” in order.

B. B. The Plaintiffs and the Defendant concluded several amendments to the instant overall contract and each of the instant contracts until the completion of the instant construction works. The details thereof are as follows.

The contract amount (cost) of April 3, 2009 to February 17, 2012 from April 3, 2009 to February 17, 2012, 200,000 on August 20, 2010, "153,531,032,000 on August 20, 2010.