On July 5, 2013, Defendant Seoul Special Metropolitan City, including the conclusion of each contract between the parties, entered into a contract with Defendant B Co., Ltd. (hereinafter “Defendant B”), and C Co., Ltd., D, E, E, and F Co., Ltd., to enter into a contract with the terms that the contract was concluded to set the contract for the supply of “basic and working drawings” (hereinafter “instant services”) of the basic and working drawings to be installed between H and I apartment crossing at the Seoul G Intersection at the entrance of Seoul Special Metropolitan City, and the working drawings to be installed between H and I apartment intersection (hereinafter “instant services”). < Amended by Presidential Decree No. 2420, Oct. 6, 2014>

(B) The former contract term was changed from October 6, 2014 to August 31, 2016 (hereinafter “instant contract term”). According to the instant contract term, joint contractors were to perform the work of formulating optimal design plans, investigating obstacles, and conducting surveys on the current status of surrounding areas of J underground teas. However, Defendant B was to perform the relevant engineering project (land and geological type).

On June 10, 2016, Defendant A Co., Ltd. (hereinafter “Defendant A”) entered into a technical service agreement with Defendant A (hereinafter “instant subcontract”) on the terms of subcontracting the ground survey service among the instant services, which was set as the contract amount of KRW 9.5 million and the service period from August 2016 to December 2016 (hereinafter “instant subcontract”).

On July 30, 2016, the employees of the Defendant A, who prepared the instant accident and the confirmation letter, conducted the ground investigation of the Gangnam-gu Seoul K K K-gu in accordance with the instant subcontract agreement around 08:30 on July 30, 2016, marking on the road surface to inform the fact that electric wires are buried underground in the line sign (electric sign board) installed by the Plaintiff on the surface of the road. The employees of the Defendant A have the function of accepting the cable and accessory materials of the Plaintiff’s electric power cables and ancillary parts while performing the astronomical work in the vicinity and concurrently holding the cable connection space. The employees of the Defendant A passed the line inside the power equipment and 154.