A. The plaintiff was a purchaser and seller who newly built and sold 1,026 households of the Handong-dong 1898 Geumdong-gu, Busan. On October 7, 1998, the plaintiff was awarded contracts at the rate of 50:10:32:8 (hereinafter referred to as "the contract of this case") with the rehabilitation company, the joint contractor for the new apartment construction of this case (hereinafter referred to as "viet company"), the Hanil Construction Co., Ltd., the Korea Development Co., Ltd., the defendant Co., Ltd., the joint contractor for the new apartment construction of this case, and the Yangyang Construction Co., Ltd., the 50:10:32:8 (hereinafter referred to as "the contract of this case"), and the shares in supply and demand of Hanyang Development Co., Ltd and Yangyang Construction Co., Ltd. were transferred to the rehabilitation company.

B. The rehabilitation company and the defendant joint construction company completed the apartment of this case and underwent a pre-use inspection on February 8, 2002, and delivered the apartment of this case to the plaintiff. The plaintiff sold the apartment of this case to the tenant around that time.

C. However, there were many defects in the apartment of this case due to the construction of the apartment of this case by the rehabilitation company, the contractor, and the defendant joint construction company, or the construction of the part to be constructed in accordance with the design drawing, or the construction of the apartment of this case by failing to execute the construction of the apartment of this case in accordance with the design drawing. At the request of the council of occupants' representatives, etc. of the apartment of this case, the rehabilitation company and the defendant joint construction company were performing part of the repair construction work, but still there were defects such as the list of defects in the apartment of this case, the repair cost, and the statement of the heating less than 0.3m to 0m to 0.4m to m to 0m to 0

On March 31, 2008, the council of occupants' representatives of the apartment of this case filed a lawsuit claiming damages (this court 2008Gahap5854, 2008Gahap21511 (Counterclaim) against the plaintiff, the rehabilitation company and the defendant corporation's joint construction business in lieu of defect repairs, and filed it with the plaintiff.