In around 2013, the Ministry of Land, Infrastructure and Transport, Seoul, and the Ministry of Land, Infrastructure and Transport, the Ministry of Land, Infrastructure and Transport, and the Ministry of Land, Infrastructure and Transport, the Ministry of Land, Infrastructure and Transport under the jurisdiction of the defendant Republic of Korea, conducted a competitive tendering procedure for air traffic center extension works (construction, civil engineering, landscaping, machinery) located within the Incheon Jung-gu Airport Business Complex (hereinafter "the construction of this case").

The Plaintiffs organized a joint supply and demand organization (the representative shall be 55% of the Plaintiff’s current status, the investment ratio shall be 55% of the Plaintiff’s current status, 25% of the Plaintiff’s low construction, and 20% of the construction of the Plaintiff’s main contractor; hereinafter “instant joint supply and demand organization”) and selected

On December 30, 2013, the Plaintiffs concluded a construction contract with the Incheon Regional Government Procurement Service under the Defendant’s control of the Republic of Korea with the cost of construction KRW 20,000,000 (total construction cost of KRW 7,722,760,000) for the first portion of the instant construction project, from January 13, 2014 to February 11, 2014 (from January 13, 2015, the final completion date of construction), with the interest rate of KRW 0.1% of the contract amount for delay (hereinafter “instant first-minute construction contract”), and the said construction contract was modified six times as follows.

6. Contract number 1: 00. 30. 20. 20. 11. 20,00,000 . 20. 11. 20,000 - 7,722,000 - 011. 28. 6, 200,000 - 30. 6,00,000 ; 6. 6. 6. 30. 6. 6. 0. 13,00,00 ; 6. 72,760, 760,000 ; 6. 6. 20. 6. 13,06. 6. 8. 6. 20,05,06. 7. 6. 06. 130,005,00