1. The Plaintiff (Counterclaim Defendant) paid KRW 4,494,578,100 to the Defendant (Counterclaim Plaintiff) and its related amount from January 18, 201 to October 19, 2011.

1. Basic facts

(a) Selection 1 of the construction project of this case and the method of executing the construction of the maritime sections of this case) Incheon Metropolitan City Reinforcement-gun that connects the service of the C-Gun C-Do Do D to the service of the military national road F-line of the military E national highways of the Gun around September 2008 (referring to the construction project of the length of 2.11km to connect H and I) and other extension sections;

hereinafter referred to as “instant construction project”

2) During the tendering procedure, the Defendant selected the Defendant as the person qualified for design and construction work under the overall method of design and construction of the pocket plates. 2) Considering that the tides in the construction site of this case are very rapid and ground and depth conditions are diverse, the Defendant, including the Plaintiff, requested four companies specializing in construction of construction sites to examine construction methods suitable for field conditions and approximate required construction costs. Accordingly, based on the data provided, the Defendant’s plan to 1-P4, P28-P38 on the bottom section where the depth of the sub-sections is low to enter the work group is difficult to enter the work group. According to the reasoning that the Defendant planned construction of the ground CD on which a bridge was installed, and the sections where the depth is able to enter the work group (P5-P27) are 1-p4, 28-P38, the Defendant’s plan to directly install the bottom 1-2, 40, 200, 20, 20, 20, 20, 4, 4, 2, 1, 2, 2, ., .).).

B. Execution of the site site conference and the conclusion of the subcontract of this case by the Defendant.