A. On March 30, 2009, the Plaintiff, etc. and the Jeju-si Construction Co., Ltd. (1) entered into a contract for construction works with the Plaintiff, etc., the Plaintiff, the Youngjin Construction Co., Ltd. (hereinafter “Jinjin Construction”), and the Sung River Co., Ltd. (hereinafter “Plaintiff, etc.”). On March 30, 2009, the Plaintiff and the Jeju-si Co., Ltd. entered into a contract for construction works with the Defendant, with the “A District Urban Development Infrastructure Corporation (1 Tools)” (hereinafter “instant construction”) at the contract price of 22,53,115,00 won, the construction period from April 6, 2009 to August 5, 2012, the compensation rate of delay damages was set at 1/1,000.

(2) The plaintiff et al. constitutes a joint contractor to implement the contract of this case. The plaintiff is the representative of the said joint contractor. The share ratio of the above joint contractor is 51%, 34%, and 15%, respectively.

B. (1) After the commencement of the instant construction project, the Plaintiff, etc. and the Jeju City concluded a contract that adjusts the contract amount without the change of the construction period, or extends the construction period without the change of the contract amount, on eight occasions.

On March 30, 2012, the change of the contract price of 22,53,15,000 on August 5, 2012 to December 21, 2009 - "20,29,29,295,222,512,820,00 on September 13, 2010, " 771,540,540,23,284,360,360,360,360 on March 3, 208, 200, 206. The change of the contract price of 20.3,06, 203, 206, 360, 360, 360, 200.