A. The Defendant, the owner of the instant construction on March 13, 2012, concluded a construction contract for the instant construction work (hereinafter “instant construction contract”) with Non-Party C limited liability company (representative D; hereinafter “Non-Party D”) which is the constructor and the multi-family house with three stories above the 1,417m2 (hereinafter “the instant building”). According to the instant construction contract, the date of completion of the instant construction work is June 30, 2012; the Non-Party Company subcontracted the instant construction work to the Plaintiff through Non-Party F on the site of the instant construction; the Defendant’s assertion that the additional construction cost should be paid to the Plaintiff on the ground that the additional construction cost should be stated as the date of completion of the instant construction work; the Plaintiff’s assertion that the additional construction cost should be stated as the date of completion of the instant construction work; and the Plaintiff’s assertion that the additional construction cost should be paid to the Plaintiff on the ground that the additional construction cost should be stated as the date of completion of the instant construction work.