All appeals by the plaintiffs are dismissed.

The costs of appeal are assessed against the plaintiffs.

The purport of the claim and appeal is the purport of the appeal.

1. The reasoning of the judgment of the court of first instance citing this case is as stated in the reasoning of the judgment of the court of first instance, except when the court makes an appeal or add it to the following paragraph (2). Thus, it is citing this as it is in accordance with the main sentence of Article 420

2. Each “D” of the first Schedule 1 and 10 pages 11 of the judgment of the court of first instance shall be written in all “A”.

"201 years" in the fourth (excluding the part of the Table) judgment of the first instance court shall be changed to "2015".

The "Building Structure Design" in Chapter 3 (excluding the part in the table) of the first instance judgment shall be applied to the "Construction Structure Design of the Newly-built Construction Work in this case from the PC (PC) structural system to the Habpo Construction System (combined Structure System)."

Part 6 of the judgment of the first instance (excluding the part on the Table) shall be added to the following:

G. From October 25, 2013 to November 29, 2016, the Defendant paid to the Plaintiffs a total of KRW 455,840,00 [the amount of service charges of KRW 132,780,00 in the contract amount of KRW 132,780,00 in the structure system of PC (PC) structure plus the service charges of KRW 57,50,00 in the cost of service charges of KRW 57,50,500 in the cost of the design change from the Hnpo method] and value-added tax of KRW 45,584,00 (the above KRW 45,840,00 in the total of KRW 10%) and KRW 501,424,00 in the aggregate of value-added tax (excluding the above KRW 45,840,00 in x 10%) and KRW 65,500 in the first instance judgment [including the above column]

An appraiser in Part 7 of the judgment of the court of first instance shall be appointed as the "ExpertJ of the first instance (hereinafter referred to as the "ExpertJ of the first instance")."

Part 8 of the first instance judgment from 9th to 21th of the 9th instance judgment shall be completed as follows.

"1-related legal principles contractor has to terminate the design service contract without completing the design, and to settle the service cost according to the work cost, the service cost is special.