A. On October 21, 201, the Defendant publicly announced a bid to the effect that “H installation works” (hereinafter “instant construction works”) are implemented by installing a storage tank of 60,000 square meters and one type of storage pumps in the site of a storage yard located in G facilities (hereinafter “instant construction”) by means of charge-mechanic construction.

2) I Co., Ltd. (hereinafter “I”).

On June 26, 2017: Plaintiff D, Plaintiff C, Plaintiff B, and Plaintiff E participated in the tender of the instant construction project by organizing a joint water level system with the representative of Plaintiff I. The I and the said Plaintiffs were selected as the successful bidder of the instant construction project around November 24, 201 [the ratio of investment to the public works works of this case: 32%, Plaintiff C23%, and 13%, respectively; 10%, total construction period of the instant construction works from 60%, and 10%: 20%, total construction period of the instant construction works of this case: 30%, total construction period of the instant construction works of each of the instant construction works of this case: 10%, 10%, 20%, and 20%, respectively, and 16%, respectively, as stipulated in Article 214 of the Construction Contract Act (hereinafter referred to as “the instant construction works of this case”).

B. After the conclusion and amendment of the contract for construction work by the number of vehicles, I (hereinafter “Plaintiff A”) and the above Plaintiffs are related to the Defendant and the instant construction work.