1. All appeals filed by the plaintiffs and the defendants are dismissed.

2. The costs of appeal shall be borne by each party.

purport, purport, and.

1. Basic facts

A. On November 18, 2015, Defendant D Co., Ltd. (hereinafter “D”) entered into a contract with Defendant E Co., Ltd. (hereinafter “E”), with the content that the construction work of constructing Defendant D’s Ansan-style houses on the land of Ansan-gu during Ansan-si (hereinafter “new construction work of this case”) shall be KRW 9.24 billion (including value-added tax) and the construction period shall be from November 18, 2015 to October 31, 2016 (No. 8) with the contract amount of KRW 200 billion (including value-added tax). The new construction work of this case is planned to subcontract by type of Defendant E, and the Defendants agreed to pay the subcontract price of KRW 200 billion in the total amount of KRW 8 billion (7 billion) to be KRW 600 billion (including the revised subcontract price of value-added tax to be paid directly by Defendant E Co., Ltd.). 2, 2000,000).

Along with the agreement to amend the terms and conditions of increase, it agreed to the effect that “the initial contract terms and conditions (matters of special agreement, estimated terms, minutes, etc.) entered into on November 18, 2015 are the same as those of the initial contract terms and conditions, and any increase or decrease in the construction cost shall be deemed nonexistent in any case.”

Eul evidence 1, below.