1. The Plaintiff:

A. 1 For Defendant friendly Industry Co., Ltd, 150,391,89 won and 99,326,141 won among them.

1. Basic facts

A. The Korean National Housing Corporation as the parties concerned is a seller who newly built and sold an apartment complex 18 Dong-dong 1,551, Dong-dong 18, Dong-dong 18, Dong-dong 547-3, Dong-dong 547-3, Dong-dong, Jung-si, the Government-si.

On October 1, 2009, the Plaintiff was a public corporation established by the merger between the Korea National Housing Corporation and the Korea Land Corporation. Pursuant to Article 8(1) of the Addenda of the Korea Land and Housing Corporation Act (Act No. 9706, May 22, 2009), the Plaintiff comprehensively succeeded to the property, claims, and other rights and obligations of the Korea National Housing Corporation.

(hereinafter referred to as "Plaintiff" without distinguishing between the above merger and the above merger. (B)

1) On December 28, 2001, the Plaintiff entered into a contract or a guarantee agreement between the Plaintiff and the Defendants, Defendant Postal Industry Co., Ltd., and the Construction Mutual Aid Association, and the Plaintiff entered into a contract on the five sections of apartment buildings of this case, and changed into the current trade name on November 8, 201, when the Plaintiff entered into a contract or guarantee agreement between the Plaintiff and the Defendants.

Defendant 1 (hereinafter referred to as “Defendant 1”)

B) Among the instant apartment construction works, 5 sections construction works and machinery construction works among the instant apartment construction works (hereinafter referred to as the “instant apartment construction works”).

(1) The construction period of the instant apartment construction works is from April 16, 1998 to July 1, 2002, the contract amount of KRW 24,786,950,00, and the contract amount of KRW 24,786,950,000 is set as the contract period for the instant apartment construction works to be the contract period for the Defendant-friendly industry (hereinafter “instant contract

The Defendant Postal Industry concluded a contract with the Defendant Construction Mutual Aid Association, as set out below. The Defendant Postal Industry established the warranty period of the warranty period of the defect warranty period under the name of the date of concluding the warranty contract for the construction project (cost) from July 10, 2002 to July 9, 2012 from July 12, 2012 to September 126, 2016 54816, 2002 to December 5, 2002, 202, which covers the obligation to repair the defects of the five sections of the instant apartment of the instant apartment of the instant apartment of the instant apartment of the instant apartment of the instant apartment of the Defendant Postal Cooperative.