1. The plaintiff's claim is dismissed.

2. The costs of lawsuit shall be borne by the Plaintiff.

1. Basic facts

A. The plaintiff is an autonomous management organization composed of sectional owners for the management of A apartment located in Suwon-gu Busan Metropolitan Government B (hereinafter "the apartment of this case"), and the defendant Dae-Gyeong Industrial Development Co., Ltd. (hereinafter "the defendant company") is an executor who newly constructed and sold the apartment of this case.

B. The Plaintiff acquired the right to claim restitution of unjust enrichment against the Defendant Company from 517 households out of the instant apartment as indicated in the list of assignment assignment holders, and notified the Defendant Company of the above transfer on October 11, 2013 and February 21, 2014 upon delegation of the right to notify the assignment of claim.

C. At the time of the public announcement of the apartment of this case, the Defendant Company posted a notice stating that “The external windows of this house must be installed outside the balcony system, based on the result of the public announcement of the project approval in accordance with Article 23 of the project approval conditions, and if the occupants individually want to install the balcony, they will consult with the project undertaker prior to the construction of the outer balcony, taking into consideration the overall appearance of the apartment house.” After installing the outer balcony heading (hereinafter “instant system heading”) with the households indicated in the attached list of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of assignment of ownership, the use approval was obtained on September 5, 2007. From 249, 1505, 105, 105, 1204, 372, 106, 802, 106, 102, 106, 1506, 108, 2508, 2010 households and 250.

The amount of a contract for the establishment of a system for each of the apartment units of this case and the amount of construction cost shall be calculated as follows:

The amount calculated by calculating the construction cost of the contract amount classified by the usual type shall be the total contract amount in 2004.