1. The Plaintiff (Counterclaim Defendant) is to pay KRW 78,301,130 to the Defendant (Counterclaim Plaintiff) and its related amount from September 20, 2014 to October 2, 2018.

1. Basic facts

A. (1) On March 21, 2008, the Plaintiff and the Defendant entered into a comprehensive responsibility supervision contract for the entire construction works of the new Bridge and the entire construction works of the Bridge and the Defendant, respectively.

o A total floor area: An education center of 14,97 square meters (4,507.25 square meters): 6,526.86 square meters (1,97.3 square meters): The date on which the construction of an education center was commenced: The date of completion of the construction period: The service performance provided by the Plaintiff after the inspection of use was completed; the service performance provided by the Plaintiff was passed by the Defendant at the Defendant’s inspection; the Defendant confirmed in writing on the completion of May 29, 28, 295.30/5.30/5.32 of the Order of Operations was completed; and the contract amount was 830,000,000 won (including value-added tax) at around February 2, 2010.

Article 747,00,000 won was paid to the Plaintiff by June 13, 2012.

Applicant and the defendant obtained approval for use on September 17, 2013.

(v) on April 7, 2016, the Plaintiff submitted to the Defendant a completion inspection report.

B. The Defendant and the non-party D (hereinafter “non-party D”) entered into a contract for the installation of cooling and heating systems and cooperative facilities, and (i) the progress thereof; and (ii) the Defendant and the non-party company entered into a contract for the installation of cooling and heating systems and cooperative facilities on February 3, 2010.

Shed Nonparty Company completed the installation work on March 31, 2012.

㈎ 그런데 소외 회사는 공기열원 히트펌프의 냉ㆍ난방기 용량이 98,000kcal/hr로 설계되었음에도 실제로는 냉ㆍ난방기 용량 98,000W의 공기열원 히트펌프를 시공하였다.

㈏ 소외 회사는 또, 계약내역서와 부하계산서에서 공기열원 히트펌프 6대, 수열원 히트펌프 4대를 설치하기로 하였으나, 공기열원 히트펌프 12대만 설치하는 것으로 변경하여, 변경된 설계에 따라 시공하였다.

However, there is little difference in the external temperature when the external temperature is 7°C in the case where the external temperature is 10°C because the external temperature was rarely affected by the external temperature and the heating capacity is 10°C in the case where the external temperature is 7°C.