A. The Korea National Housing Corporation (the Korea National Housing Corporation and the Korea Land Corporation were merged with the Plaintiff on October 1, 2009; hereinafter “Plaintiff”) is a project proprietor who constructed and sold the 768 household units in Suwon-gu, Suwon-si (hereinafter “instant apartment”) and obtained approval for the use of the instant apartment from the competent authority on December 5, 2001.

B. On March 8, 1999, the Plaintiff entered into a contract for apartment of this case and a joint and several sureties contract. The Plaintiff was divided from ELS Co., Ltd. (Defendant ELS Co., Ltd.) on April 1, 2009.

Defendant 1 (hereinafter “Defendant ELS”)

3) As to the production and installation of assembly rooms of the apartment of this case and the company for the promotion of reinsurance (hereinafter “instant bathing room contract”)

(2) On March 5, 2001, the Plaintiff entered into a contract with D Co., Ltd. (A) on March 21, 2003 (hereinafter “A”) and the instant apartment construction, civil engineering, telecommunications and telecommunications equipment construction works (hereinafter “instant contract”). According to the aforementioned contract clause, the warranty period of A is as follows.

On the other hand, Defendant Incorporated Co., Ltd. (hereinafter “Defendant Filicy”) jointly and severally guaranteed the obligation of Defendant B with respect to the construction machinery and telecommunication works of the apartment of this case among the contract of this case, and Defendant Bsan Construction Co., Ltd. (hereinafter “Defendant Bsan Construction”) among the contract of this case, the obligation of Defendant B with respect to the landscaping works of the apartment of this case.

The Plaintiff and A entered into the instant contract, and the Defendant’s filial duty is part of the instant contract.