1. The plaintiff's claim is dismissed.

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

1. Details of disposition;

A. The Plaintiff is a constructor who runs a construction business.

2) The Plaintiff contracted the construction work of B apartment (3 tools, construction period from June 30, 2017 to September 21, 2019; hereinafter “instant apartment”) with the Defendant to jointly supply and demand enterprises (80% of its equity ratio). B. From September 3, 2018 to January 18, 2019, the Board of Audit and Inspection conducted an audit on the status of operation of the noise reduction system between apartment floors, such as prior recognition of the noise cutting structure of apartment floors, construction, performance assessment, etc., for apartment construction projects implemented by the Defendant, etc.

2) As a result of the measurement of noise between floors for the total 191 households of apartment units scheduled to move in at the completion stage by the Board of Audit and Inspection, 184 households showed that the actual performance grade was lower than the prior approved performance grade, and 114 households among them were below the minimum performance standard.

3) As a result of the inspection conducted by the Board of Audit and Inspection of the noise-preventive performance of the sample generation prior to the execution on the 89 site where the sample generation was located in the 115 construction sites conducted by the Defendant, it was confirmed that the noise performance was measured after the 31 construction sites including the instant construction sites, which did not measure the performance of the sample generation noise or 2 to 382 days after the commencement of the construction works.

4) As a result of the 31 construction sites ordered by the Defendant, the Board of Audit and Inspection conducted a survey of floor concrete sludge level, and found that the 27 construction sites, including the instant construction sites, including the criteria for recognition and management of the shocking structure of the apartment-unit housing floor (amended by Presidential Decree No. 2019-622, Nov. 8, 2019; hereinafter “instant public notice”) failed to maintain a flat not exceeding 7m per 3m per 7m (hereinafter “instant standard”).

5) On April 18, 2019, the Board of Audit and Inspection shall relate to the defendant when publishing the audit results.