1. Of the instant lawsuit, the joint management of Defendant Pung Forest Industry Co., Ltd. and Defendant Rehabilitation Obligors Construction Co., Ltd.

1. Basic facts

A. 1) The Korea National Housing Corporation is a party to the dispute. The Korea National Housing Corporation is a party to the dispute with 14-dong 14-dong apartment complexes of small-type 4,104 (hereinafter “the apartment of this case”).

A) A newly built executor and sold in lots. On October 1, 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”) pursuant to Article 8(1) of the Addenda to the Korea National Housing Corporation (amended by Act No. 9706, May 22, 2009) as a public corporation established following the merger between the Korea National Housing Corporation and the Korea Land Corporation (hereinafter referred to as “Korea National Housing Corporation”).

2) Defendant Newdong Construction Co., Ltd. (hereinafter “Defendant Newdong Construction”), Yadong Comprehensive Construction Co., Ltd. (hereinafter “Defendant 1”) was merged with Pungdong Construction Co., Ltd. on or around December 31, 2008, and Pungdong Construction Co., Ltd. changed its trade name to Pungdong Construction Co., Ltd. at around that time; hereinafter “Pungdong Construction”) and Defendant Pung Forest Industry Co., Ltd. (hereinafter “Defendant Pung Forest Industry”) contracted construction works on one of the instant apartment construction works (hereinafter “the instant construction works”), and Defendant Pungdong Construction Co., Ltd. (hereinafter “the instant construction works”). The Defendant Pungdong Construction Co., Ltd constructed the wastewater treatment facilities (hereinafter “construction facilities of this case”), among the said construction works, by means of sharing the construction works of the instant construction works (hereinafter “construction works of the instant Section 1”) and the remainder of construction works of the instant construction works (hereinafter “the instant construction works”).

3) Defendant Heavy Construction Co., Ltd. (hereinafter “Defendant Heavy Construction”)

) South Young Construction Co., Ltd. (hereinafter referred to as “Nam Young Construction”)

2) Of the instant apartment construction project, construction works for the second section of the instant apartment construction project (hereinafter referred to as “construction works for the second section”).

is a co-contractor awarded a contract, and