1. The Defendant’s KRW 3,844,318,315 to the Plaintiffs and 6% per annum from June 28, 2013 to May 14, 2014.

On the premise of fact, the Plaintiffs were determined as successful bidders by participating in the bidding "the implementation plan for the operation of the EXPO 2012 EXPO 201, publicly announced on August 27, 2010 by the President of the EXPO 2012 EXPO 201."

Accordingly, on October 29, 2010, the Plaintiffs entered into a service contract with the Defendant with the content that the total business amount of KRW 47,247,00,000 and the total business period from October 29, 2010 to November 12, 2012 with respect to vicarious services related to the operation of the said Chairperson.

On September 30, 2011, the Defendant concluded a contract with the Plaintiffs to change the total amount of business to KRW 58,180,000,000 on September 30, 201, by deciding to entrust with the operation of exhibition centers and exhibition facilities as an agent.

After that, the final service contract was concluded between the plaintiffs and the defendant to change the total project amount to KRW 50,782,00,000.

The contents of the service contract, special terms, business instructions, and calculation sheets, which are attached to the above service contract, such as the special terms and conditions of the service contract, are as follows:

The definitions of terms used in this condition of Article 2 (Definitions) of the Special Conditions of the Service Contract shall be as follows:

3. The term "supervision company" means a supervisory company contracted with a supervisor A for the purpose of ascertaining the status of supply and demand of Chairperson, human resources, goods, etc. and for ex post facto cost calculation,

Article 3 (Supervision) (2) Affairs conducted by a supervising company shall be as follows:

1. Confirmation and actual inspection of the current status of supply and demand of the operating personnel of the Chairperson in control of the Plaintiff B;

3. Confirmation and verification of the supply and demand conditions by item of the materials related to the operation of the Chairperson that he/she receives by project costs or other methods;

5. Confirmation of all accounting documents related to the performance of services, including the supply and demand of human resources and goods of Eul;

7.Review the settlement of accounts submitted by B pursuant to paragraph 1 of Article IV (Determination and Settlement of Project Costs) (1) of the calculation of the total amount of the settlement of accounts through the ex post facto cost calculation. B shall relate to the settlement of accounts of project costs when the settlement of accounts is completed.