1. All of the plaintiffs' claims are dismissed.

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

1. Basic facts

A. Defendant KS Construction Co., Ltd. as the parties (hereinafter “Defendant KS Construction”) is a construction company that constructed A apartment (which consists of a total of 879 households and ancillary welfare facilities of the nine-story apartment units on the ground of the underground floor and the ground 30-story apartment units; hereinafter “instant apartment”) located in the Seo-gu, Seo-gu, Incheon, Seo-gu, Changdong, Young-dong, and the Incheon Free Economic Zone Cheongbu District (hereinafter “Cheongbu District”) located in approximately 18m2, Seohee-dong, Seo-dong, Incheon, and the Plaintiff entered into a contract to purchase the instant apartment (hereinafter “instant sales contract”) with the Defendants around June 2009.

B. Around 2002, the government established, around December 30, 2002, a master plan for the Cheongra District Development Plan, etc., including the contents of creating free economic zones centered on Incheon, Busan, Busan, and Gwangju, and Gwangju. The Act on Designation and Management of Free Economic Zones was enacted by Act No. 6835 on December 30, 2002. The above Act provides for the designation of free economic zones, cancellation of designation, implementation of development projects of free economic zones, support for business activities of foreign-invested enterprises, etc. (2) The Cheongra District in which the apartment complex of this case is located was located as prescribed by the Ministry of Finance and Economy Notice No. 2003-19 of August 11, 2003, which was designated as the Incheon Free Economic Zone as the Incheon, Seo-gu, Seo-dong, Changdong, Seodong, and Seo-dong, Incheon, and the development plan for knowledge and information regarding the Cheongra District, and the development plan for the Korea Housing Corporation (hereinafter referred to as "Korea Land & Housing Corporation 10.