1. The plaintiff's claim is dismissed.

2. Of the costs of lawsuit, the part pertaining to the participation in the litigation is the intervenor joining the Plaintiff.

1. Basic facts

A. As to reinforced concrete construction works among the projects for expanding dormitories at international universities and colleges located in Pyeongtaek-si, Pyeongtaek-dong, Pyeongtaek-dong, the contractor was the Defendant on July 15, 201, and the contractor was the Plaintiff, and the subcontractor was the contractor’s construction cost of KRW 1,573,00,000 (including value-added tax) and the construction period of KRW 1,573,000 (including value-added tax) and the subcontract was concluded on July 15, 2012.

(hereinafter referred to as “the first construction contract”). (b)

1) With respect to reinforced concrete construction works among the construction works for the new construction of Ansan-dong and 600-4 and 2 parcels on the ground, the subcontractor was the defendant around May 2, 201, and the contractor was the contractor as the plaintiff (including value-added tax) and the subcontract was entered into on May 2, 2011 with the construction period of KRW 1,089,000 (including value-added tax) and on July 31, 201 (hereinafter “the second construction contract”).

(2) The construction period of the second construction contract was changed on May 2, 2011 to August 31, 2011, and later changed on August 31, 201, and again on May 2, 2011 to September 30, 2011.

C. 1) With respect to reinforced concrete construction works among the construction works for construction works for 25, 25-4 ground wave hotel in Pluju-dong, the contractor was the Defendant on May 2, 201, and the contractor was the Plaintiff, and the subcontractor was the Defendant on May 2, 201, and the subcontract was executed on May 2, 2011 to December 31, 201 for the construction period (hereinafter “third construction contract”).

(2) A contract for the third construction project was partially modified on December 201, 201, and the construction period was extended on March 31, 2012, as the details of the design modification of the said construction project were altered to KRW 74,700 (including value-added tax) from KRW 693,00,000 to KRW 744,70,00.

[Grounds for recognition] Gap evidence Nos. 1, 13, 15, 24, Eul evidence No. 5, and the purport of the whole pleadings

2. The plaintiff's assertion and judgment as to the plaintiff

A. The Plaintiff asserted that the construction work was subcontracted to the Defendant with the content as seen earlier, and the Plaintiff incurred additional construction cost due to changes in the construction content as follows during each construction work process.

Therefore, the defendant.