1. All of the plaintiffs' claims are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. Basic facts

A. On October 11, 2005, Nonparty D purchased the instant land from Nonparty F in order to newly build an apartment house (hereinafter “instant apartment house”) on a parcel of land, other than 1,562 square meters, Gyeonggi-do E Forest Land (hereinafter “instant land”). At the time, Nonparty D agreed to obtain a loan from a financial institution and pay the remainder by April 30, 2006 when the structural construction is completed by performing a new construction project under the name of F (hereinafter “new construction project”).

B. Around March 1, 2006, G Co., Ltd. (hereinafter “G”) entered into a contract with G Co., Ltd. (hereinafter “G”), under which G entered into a contract for the construction of the instant new construction works, all of the interior works, damp construction works, all of the damp construction works, and paint construction works. At the time of completion of the structural construction by G, D obtained approval for the use of the building (the scheduled date November 30, 2006) and paid the construction cost by obtaining the loan as security, and if it is impossible to grant the loan, D agreed to transfer the ownership of part of the instant multi-family housing to G.

C. Around March 2, 2006, D entered into a contract with H Co., Ltd. (hereinafter “H”) to contract for the installation work of the instant new construction project, and paid the construction cost in cash within 30 days after completion of the construction work, but the construction cost cannot be paid by December 30, 2006, H as the ownership of the instant collective housing I and J was transferred.

D Around June 2006, when F was unable to pay the remaining price of the instant land to F, G transferred its authority as an executor and a contractor of the instant new construction project to G. On June 29, 2006, G acquired the obligation of construction cost that D had not been paid to the subcontractor with respect to the instant new construction project, and confirmed the obligation as specified in the following table between D and D. Upon completion of the approval for use of the instant multi-family housing, it shall prepare a letter of performance with the following contents.