1. The judgment of the first instance, including the first and second preliminary claims added by the plaintiffs in this Court, is as follows.

1. The reasoning for this part of this Court’s reasoning is as stated in Paragraph 1 of the reasoning of the judgment of the court of first instance, and thus, this part is cited in accordance with the main sentence of Article 420 of the Civil Procedure Act

2. Summary of the plaintiffs' assertion

A. 1) The instant contract is a long-term continuing construction contract, and there exists separate contracts between the overall contract and each number of contracts. The Plaintiffs and the Defendant separately concluded a modified overall contract that alters only the terms and conditions of the overall contract without changing all of them, and agreed on binding force as to the period of total construction under the overall contract, including the warranty period, the total contract amount, and the total contract period calculated based on the total contract amount and the total contract period. However, as the period of total construction under the instant overall contract extended from December 28, 2012 to April 1, 2014 on the grounds of the Defendant’s responsibility, such as delay in securing each of the instant construction sites, etc., the total contract period under the instant overall contract was extended from December 28, 2012 to April 1, 2014, the total contract amount should be adjusted to increase the indirect construction cost paid by the Plaintiffs due to the extension of the total contract period under Article 23 of the General Conditions of the Construction Contract.2) The Plaintiffs filed an application for adjustment to the Defendant prior to pay the final price

3) Therefore, according to the Plaintiffs’ investment ratio, the Defendant is obligated to pay the Plaintiff KRW 1,207,611,600 (=3,019,029,000 x 40%) to Plaintiff B, KRW 1,056,660,150 (=3,019,029,00 x 35%) to Plaintiff C, KRW 452,854,350 (= 3,019,029,000 x 15%) to Plaintiff C, and KRW 301,902,900 (=3,019,029,000 x 15%) to Plaintiff D, and each of the ancillary claims for delay damages.