A. The status of the parties (1) The Korea National Housing Corporation (the plaintiff became the plaintiff in consequence of the merger with the Korea Land Corporation on October 1, 2009; hereinafter collectively referred to as the "the plaintiff") is a project proprietor who newly built and sold 13 apartment complexes 1,224 units in Dongdaemun-gu, Dongdaemun-gu, Seoul (hereinafter referred to as the "the apartment of this case"), and obtained approval for the use of the apartment of this case on October 29, 2001.

(2) Defendant Western Co., Ltd. (hereinafter “Defendant Newdong Construction”), Defendant Newdong Construction Co., Ltd. (hereinafter “Defendant Newdong Construction”), and Defendant Two Industries Co., Ltd. (hereinafter “Defendant Two Industries”) are the time projects for which each contract was entered into with the Plaintiff for construction works on the apartment buildings and ancillary facilities of this case, and construction works on each construction section (hereinafter “instant one contract”).

(3) On the other hand, the defendant Grand Construction Co., Ltd. (hereinafter the defendant Grand Construction Co., Ltd.) is the contractor of the landscaping construction in the apartment in the instant apartment, the defendant Jeon In case of the defendant (hereinafter the defendant in case of the defendant), the joint and several surety of the Postal Construction Co., Ltd. that received the electrical construction in the instant apartment, and the defendant Dolve Industry Cooperatives of the Republic of Korea (hereinafter the defendant in case of the defendant in case of the defendant in case of the defendant in case of the defendant in case of the construction in the instant apartment, and the warranty warranty period of the contract

- Defendant Substitute Construction: Two years from the date of receipt of the object and the date of completion of completion inspection, whichever comes first - Two years from the date of completion of the inspection : two years from the date of completion of the inspection - Defendant Korean Bart: one year from the date of completion

B. (1) After the use approval of the apartment in this case, the council of occupants' representatives of the apartment in this case (hereinafter referred to as the "council of occupants' representatives") has defects such as non-construction or defective construction on the apartment in this case.