1. In the judgment of the court of first instance, the defendant Han-new Co., Ltd., Seo Seo, Dong New Construction Co., Ltd. and the stock company.

1. Basic facts

A. The Plaintiff’s status Korea National Housing Corporation (the Plaintiff was merged with the Korea Land Corporation on October 1, 2009, and the Plaintiff comprehensively succeeded to the rights and obligations of the Korea National Housing Corporation; hereinafter “the Plaintiff”) is a project proprietor who constructed five apartment complexes of 727 units, i.e., five apartment complexes of 10, 19, 199, North Korea National Housing Corporation (hereinafter “the apartment of this case”).

B. On October 6, 2003, which is a joint and several sureties who is a joint and several sureties who is a contractor for the contract for the conclusion of a contract and the completion of a construction work, the Plaintiff concluded a contract for construction and joint and several sureties Construction Co., Ltd. on September 1, 2002 as follows with respect to the construction and machinery parts, civil engineering parts, and landscaping parts of the instant apartment construction, and the Plaintiff leased the instant apartment after undergoing a pre-use inspection on April 27, 2007, but converted the sale thereof on January 1, 2013.

C. 1) Defendant Construction Financial Cooperative Co., Ltd. (hereinafter “ extreme Dong Construction”) entered into a warranty contract

A contract for the repair of defects was concluded with regard to the following defects after the completion of construction and usage inspection. The warranty number of 22173,36714 (costs, bearing walls) from March 5, 2007 to March 4, 2017; 214,81,88; 22174,36717; - March 5, 2007 to March 24, 2012; 246,393,36721 (designated, 207, 207.36.36.75; 207.36.74; 207.75.36.74; 207.75.36.74; 207.75.75.76.27.75