A. On November 2, 2015, the Plaintiff contracted with G Co., Ltd. for the construction of an officetel in Seo-gu Incheon Metropolitan City H (hereinafter “instant construction”) with the contract price of KRW 7.15 billion, and commenced the instant construction work on December 1, 2015.

B. The Defendant established a waterworks business headquarters under the jurisdiction of the Mayor and installed and manages the waterworks facilities. At the time of the instant construction, the water supply pipes (HI-VP, 150 meters in diameter, hereinafter “instant water supply pipes”) were installed at the location of underground 1.4 meters underground along the roads adjacent to the relevant site and the neighboring land of Seo-gu, Incheon, Seo-gu, J, H and K at the time of the instant construction.

C. At the request of the Plaintiff, while the Plaintiff was carrying out the instant construction, water leakage detection was conducted on May 26, 201 at the Seodo Waterworks Business Office under the Defendant’s control at the time of the Plaintiff’s continuous flow of water from the car wall using the earth gate, but the Defendant did not have any particular reaction in the reagents reaction and Cheongtory Inspection. Therefore, the Defendant did not verify the water leakage of the instant water supply pipe.

Afterwards, water leakage and the Defendant’s water leakage restoration works were carried out several times as shown below, but large volume of tap water flowed into the underground ground-breaking section of the instant construction site on June 12, 2016 due to water supply pipes escape from the water supply pipes. As such, the temporary site-breaking section and the ground-breaking section were completely flooded.

On May 26, 2016, the water leakage portion of the water leakage date and the Defendant’s water leakage treatment status (the first water leakage) on May 26, 2016, the employees of the Seocho Waterworks Business Office under the Defendant’s jurisdiction visit the site, but did not have any color reaction to the test of reagents, and did not confirm the water leakage of water supply pipes due to the lack of any change in water flow. The water leakage out of the part of the attached Form (A) on June 7, 2016 (the second water leakage), resulting in the water leakage of water pipes in the part of the attached Form (A) of the water supply pipe, the Defendant would repair the water leakage of the water supply pipe with a d150m-meter-mn load of drinking water supply. The Defendant would replace the water leakage out of the part of the attached Form (the third water leakage) drawings or (b) of the water pipe, thereby making a V conclusion-type death.