A. The construction of credit machinery by Defendant Co., Ltd. is KRW 18,548,652 and its amount from December 29, 2015.

A. The Plaintiff is the council of occupants' representatives of apartment houses composed of representatives from each Dong of A apartment located in Da in the original city in the original city in the original city, and the Defendant C works as the president of the Plaintiff and resigned on October 3, 2013.

B. On April 25, 2012, the Plaintiff (the president at that time was Defendant C) decided to convert the heating method of the instant apartment from the central heating system to the individual heating system. On May 7, 2012, the Plaintiff selected the construction of credit machinery (a corporate name was changed to broroth; hereinafter “Defendant Company”) to the individual heating system (hereinafter “instant individual heating system”) on May 22, 2012 through the public tender on May 7, 2012, and on May 29, 2012, the Plaintiff (the president at that time was the Defendant Company) contracted each of the instant individual heating systems with the Defendant Company for construction amounting to 379,50,000 construction period, and from June 1, 2012 to August 31, 2012 as the individual heating system agent at the site (hereinafter “instant individual heating system”).

C. The main contents of the general terms of construction contract included in the instant individual heating construction contract are as follows.

In addition, on August 30, 2012, the Plaintiff decided to replace the water supply method of the instant apartment from the high-priced tank water supply method with the secondary water supply method. The Plaintiff concluded a contract with the Defendant Company by setting the construction amount of KRW 123,415,00 with respect to the installation of the secondary water pumps (hereinafter “instant secondary water pumps”) between the Defendant Company and the construction period from September 8, 2012 to September 25, 2012, with respect to the installation of the secondary water pumps (hereinafter “instant secondary water pumps”).

(hereinafter “instant secondary pumps Construction Contract”). E.

On September 26, 2012, the Plaintiff confirmed the completion of the instant individual heating works, and confirmed the completion of the instant secondary heating works on October 29, 2012, and paid all the construction cost to the Defendant Company around that time.

(f).