1. The plaintiffs' claims are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. Details of the disposition;

A. From December 2012, the Defendant entered into a design service contract, design service contract, and construction contract with a design company, construction company, and implemented C’s runway, taxiway, taxiway-gun located in Gyeongcheon-gun (hereinafter “instant construction”).

The main contents of the instant construction are cutting the existing concrete packaging surface in a certain depth (7 cm from the runway, taxiway, and 6 cm from the runway), and breaking concrete with the combination of gral oil oil on the cut concrete.

B. The Plaintiff Co., Ltd. (hereinafter “Plaintiff Co., Ltd.”) that had been entrusted with construction management services for a majority of the construction works performed by the Defendant’s ordinary facility group (hereinafter “Plaintiff Co., Ltd.”) from the Defendant, upon receiving a request from the person in charge of the construction project management of the Plaintiff’s ordinary facility group on November 2013, the Plaintiff Co., Ltd. (hereinafter “Plaintiff Co., Ltd.”) to provide supervision services for the instant construction works from the person in charge of the construction project management of the ordinary facility group. On November 16, 2013, the Plaintiff Co., Ltd. conducted the work, such as checking whether concrete cutting and typology are appropriate

C. At the beginning of May 2014, the runway repaired through the instant construction and the concrete packaging of oil-based roads are not properly attached to a cut off surface, and there were many instances where ruptures occurred on the concrete packing surface and ruptures.

On September 11, 2015, the Defendant: (a) applied Article 53 of the Construction Technology Promotion Act and Article 87 [Attachment 8] [Attachment 8] 2.1 and 2.7 of the Enforcement Decree of the same Act, on the ground that “The Defendant, as a construction project management service company of the instant construction project, did not check whether the existing concrete has been properly cut in depth as set out in the design standards; and (b) did not confirm the strength of attachment, which is the most important quality control item, in the packing method covered after cutting, and caused damage to the new and new concrete area.”

hereinafter referred to as "the case."