1. The plaintiff's claim is dismissed.

2. The costs of lawsuit shall be borne by the Plaintiff.

1. Basic facts

A. The status of the party is the owner who planned to construct officetels and neighborhood living facilities on the ground of Suwon-si, Suwon-si with the size of 4th underground and 14th above ground, and the defendant is the contractor who was awarded a contract for the construction of the above building (hereinafter the above construction referred to as "the construction of this case" and the contract between the plaintiff and the defendant for the construction of this case) and the non-party corporation B was awarded a subcontract for the construction of civil works during the above construction.

Meanwhile, Nonparty C Co., Ltd. (hereinafter “C”) is the designer of the instant construction project and the overall supervisor, and Nonparty D Co., Ltd. (hereinafter “D”) is the designer and supervisor of the said construction project.

B. On February 26, 2014, the Defendant presented a written estimate of KRW 7,621,00,000 (hereinafter “the first written estimate”) applying CIP method to the Plaintiff on the basis of the initial design drawings. (2) The Defendant, around February 28, 2014, changed the details of the first written estimate from CIP to SCW method, thereby reducing construction cost of KRW 226,920,00, and transmitted the files to the Plaintiff regarding the reduction of construction cost of KRW 226,920,00 from among the details of the first written estimate to the Plaintiff; and (3) the Defendant, on March 3, 2014, changed the construction, equipment, and electrical type from among the details of the first written estimate, reduced the construction cost of KRW 226,70,00,00 and transmitted the file reduction factors of the contents of the construction cost of CIP method, which recommended the construction cost of CIP method rather than SCW method.

4) Ultimately, the Plaintiff and the Defendant concluded the instant construction contract based on the final statement that reflected the quotation on March 12, 2014 (Evidence 3-2) and the contract amount of KRW 7,300,000,000 (value-added tax separate, commencement: April 1, 2014; completion: October 31, 2015) including advance payment of KRW 365,00,000,00.

On the other hand, among the above specifications, the parts relating to the construction work are as follows.

C. The construction of this case.