A. The Plaintiffs are the occupants of the G apartment in Seongbuk-gu Seoul Metropolitan City (hereinafter “instant apartment”). Defendant G council of occupants’ representatives (hereinafter “Defendant G council”) is an unincorporated association composed of the representatives of the instant apartment buildings by Dong, and Defendant H Co., Ltd. (hereinafter “Defendant Company”) entered into a collective housing management contract with the Defendant’s council of occupants’ representatives on February 1, 2017 (hereinafter “instant consignment management contract”) and entrusted management of the instant apartment.

B. The instant apartment complex is an apartment complex completed by the four construction companies (I, J, K, and L Co., Ltd.) jointly with the project implementation authorization, and the council of occupants’ representatives decided to separately manage the instant apartment complex from May 9, 2016 to May 15, 2016.

Since then, an apartment complex constructed by I Co., Ltd. ( nine units; hereinafter referred to as "M apartment complex"), and 32 units of the instant apartment complex built by the construction company other than I Co., Ltd. (hereinafter referred to as "Y apartment complex") had been completed at the time of the enactment of the management rules and the report on the formation of the council of occupants' representatives under separate management, and the said report was accepted around November 30, 2016. Such fact was notified to the management office of the instant apartment complex around December 6, 2016.

C. On May 2016, the existing representatives and executive officers of the instant apartment complex were to maintain their status by December 31, 2016 with the consent of all the occupants. The election commission of the instant apartment complex held the election of the representatives of the instant building on December 2, 2016 and December 14, 2016 (hereinafter “election of the representatives of the instant building” and “election of the representatives of the instant secondary buildings”) on December 16, 2016, following the expiration of the term of office of the representatives and executive officers of the instant apartment complex.