A. On the ground of Ulsan-gun Group C, Ulsan-gun, the Plaintiff, which owned by the Plaintiff, decided to newly construct a multi-household 10 building (hereinafter “instant building”), and on July 8, 2016, drafted a contract agreement with the Defendant as the contractor with respect to the said new construction (hereinafter “instant construction”).

(hereinafter referred to as “the first contract of this case” and the contract under this is referred to as “the first contract of this case”). The main contents of the first contract of this case are as follows:

Standard contract for private construction works

1. The name of the construction project: The construction project for 10-household complex with three generations in Ulsan-gun, Ulsan-gun;

2. Place for construction: Ulsan-gun C

3. Date of commencement: Seven months from the date of commencement.

5. Contract amount: 10. Warranty liability (in the case of a multi-purpose type, the classification by type of work) set as the warranty period under the Framework Act on the Construction Industry in lieu of a warranty period of construction 3% of the contract amount by type of work (excluding value-added tax) and the warranty period of 28,50,000 of the contract amount by type of work; 10. Warranty liability (in the case of a multi-unit type of work, the classification by type of work): 24% per year (in the case of a balance after completion of the construction), 13. Other matters: 24% per annum (in the case of a construction work, the balance after completion of the construction work) 13.

(2) The separate amount shall be calculated as KRW 197,300,000 for household appliances and additional interior expenses.

B. On March 15, 2017, the Plaintiff prepared a letter of change of the construction price (hereinafter “instant letter of change”) to the Defendant, “I confirm that the person in question has increased the amount of the construction price to the Defendant in the amount of the construction work (contractor 950,000,000, and VAT separate), in the amount of the construction work, in the amount of the construction work, in the amount of the construction work, in the amount of the construction work, the sum of the KRW 950,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,000,00