1. The plaintiff's claim is dismissed.

2. The costs of lawsuit shall be borne by the Plaintiff.

1. Basic facts

A. On May 25, 201, the Plaintiff and the Defendant concluded a long-term continuing construction contract with the total construction cost of KRW 5,686,979,00 for B construction, the total commencement date of construction work as of June 1, 2011, and the completion date of the total completion date of the long-term continuing construction works as of January 20, 201, and changed the construction cost of the first lane to KRW 1,081,562,00 (the total completion date of the long-term continuing construction works was changed to KRW 1,051,473,50 on December 22, 201), the commencement date of the construction work as of June 1, 201, and the completion date of the scheduled completion date of the construction works as of December 27, 2011.

B. On March 30, 2012, the Plaintiff and the Defendant concluded a secondary construction contract with the commencement date of construction work as KRW 779,991,00 (amended by KRW 748,570,000 on August 14, 2012) and the commencement date of construction work as of April 4, 2012, and the completion date of construction works as of July 27, 2012.

C. On October 15, 2012, the Plaintiff and the Defendant concluded the third construction contract with the date of commencement of construction work as of October 16, 2012 and the date of completion of construction work as of December 24, 2012.

On March 27, 2013, the scheduled completion date of the relevant long-term continuing construction contract was changed from January 20, 2013 to October 22, 2013, on the ground of the extension of the period of suspension by the number of vehicles following the repair work.

E. On March 28, 2013, the Plaintiff and the Defendant concluded the fourth construction contract with the date of commencement of construction work as of April 1, 2013, and the date of completion of construction work as of August 28, 2013, with the construction cost of KRW 1,746,158,00 (amended by KRW 1,713,60,000 on October 7, 2013).

F. On July 15, 2013, the Plaintiff and the Defendant agreed not to raise an objection, etc., when concluding a contract to modify construction works that extend the construction period from the initial 600 days to 660 days, and accordingly, the Plaintiff and the Defendant agreed not to raise an objection, etc.

G. On August 28, 2013, the Plaintiff and the Defendant concluded the five construction contracts with the date of commencement of construction works as of August 29, 2013 and the date of completion of construction works as of December 21, 2013, with the construction amount of KRW 1,494,478,50 (amended by KRW 1,631,00,000 on December 31, 2013).

H. The Plaintiff does construction work according to the construction contract for each of the above units of vehicles.