1. The Defendant (Counterclaim Plaintiff) paid KRW 816,067 to the Plaintiff (Counterclaim Defendant) and its related amount from November 29, 2014 to February 7, 2017.

1. Basic facts

A. On October 29, 2010, the Plaintiff entered into a construction contract (hereinafter “instant contract”) with the Defendant and Seo-gu Incheon Metropolitan Government with respect to the construction of the instant building (hereinafter “instant building”) with the construction cost of KRW 440,000,000 (the contract amount of KRW 10,000,000, intermediate payment of KRW 220,000,000, the remainder of KRW 210,000,000, and the remainder of KRW 210,000,000) (hereinafter “instant construction contract”). As a special agreement, the Plaintiff entered “no additional cost” and “a rooftop room and office” as included in the contract.

B. On December 6, 2010, the Plaintiff and the Defendant drafted an additional contract for the instant contract, and the main contents are as follows.

Article 1 (Name D New Construction Works) D New Construction Works and Incidental Works (Fixture: 40 million won for 40,000 won for Amended Construction Works) Article 2 (Fixture 10: From December 10, 2010 to April 30, 2011, the first down payment (10%) Article 4 (Conditions for Prohibition: 44 million won for 20% for 3rd New Construction Works: At the time of completion of 88,00,000 won for 48,000 won for 40,000 won for 40,000 won for 40,000 won for 40,000 won for 66,00 won for 40,000 won for 40,000 won for 5,000 won for 5,00 won for 40,000 won for 50,000 won for 460,000,000 won for 74,00.

Article 8 (Change of Breeding)

1. Even during the execution of this construction, the Defendant may change part of the specifications when the Defendant considers it necessary, and the Plaintiff does not require any additional burden even when extension of the construction period and increase or decrease of the construction amount are necessary.

in this case.