1. The judgment of the court of first instance is modified as follows.

The defendant shall pay to the plaintiff KRW 908,623,169 and KRW 875,365,948 among them.

1. Basic facts

A. A. Around November 2007, the Plaintiff entered into a contract with the Defendant and the Cheongju-si, with the terms and conditions that the construction cost of the soil works and the ancillary civil works (hereinafter “instant construction works”) was KRW 4.73 billion (including value-added tax) and the completion date on May 31, 2009; and the interest rate due to the delay in the payment of the construction cost was set at nine percent per annum (hereinafter “instant contract”).

B. The instant construction project is largely divided into the first, second, and third-lanes depending on its location, and the first, second, and third-lanes can be divided into the first, second, and third-lanes, and the second, Jdong and third-lanes can be divided into the ground-breaking work and the installation work (referring to the construction work to prevent the collapse or collapse of soil piling or ground-breaking).

C. From December 6, 2007, the Plaintiff continued the instant construction from around December 6, 2007, and suspended the instant construction work to the firstman on June 2008.

At the time of the discontinuance of the instant construction, the part corresponding to the ground-breaking construction is generally finished, but the part of the soil-shield construction was not performed.

[Ground of recognition] The fact that there is no dispute, Gap evidence 1, Eul evidence 5, and 8 (including numbers of evidence) , the result of the appraisal by the trial appraiser AT, the purport of the whole pleadings

2. Determination as to the cause of action

가. 이 사건 도급계약에 따른 공사대금 1 기성고율 및 기성공사대금 당심 감정인 AT의 감정결과에 변론 전체의 취지에 의하면, 이 사건 I동, J동에서 암발파 방법에 의한 오픈컷 공사가 이루어져 흙막이 공사를 하지 않아도 되는 상태이고, 이 사건 K동의 경우에도 오픈컷 공법으로 공사가 이루어져 흙막이 공사가 필요 없는 상태이며, 그에 따라 이 사건 공사에서 흙막이 공사가 없더라도 후속 공정을 진행하는 데 별다른 문제가 없는 점, 원고가 완료한...