1. The Plaintiff:

A. Defendant B Co., Ltd.: from March 18, 2018, for KRW 507,203,374 and KRW 300,000 among them;

1. Basic facts

A. 1) The Plaintiff is the 327 household units (298 household units, 17 household units, 12 household units) and ancillary facilities (hereinafter “instant building”) of the building A located in the Heung-gu, Chungcheongnam-gu, Chungcheongnam-gu, Chungcheongnam-gu, Chungcheongnam-gu.

(2) For the management of the building of this case, Defendant B Co., Ltd. (hereinafter “Defendant Company”) is a project proprietor who constructed and sold the building of this case, and Defendant B Co., Ltd. (hereinafter “Defendant Intervenor”) and Defendant A Co., Ltd. (hereinafter “Defendant Intervenor”) and G Co., Ltd. (hereinafter “G”) are the construction works of the building of this case.

3) For the Intervenor who is the contractor of the instant building, the Defendant CF (hereinafter “Defendant CF”) guaranteed the obligation to repair defects after the inspection on the instant building’s completion and the conclusion of the contract for the repair of defects. (B) On September 21, 2015, the Defendant CF concluded a guarantee agreement (hereinafter “instant guarantee agreement”) with the Defendant’s Intervenor to guarantee the obligation to repair defects after the inspection on the instant building’s completion and the conclusion of the contract for the repair of defects. In order to guarantee the obligation to repair defects after the inspection on the instant building’s completion and the repair of defects, the Defendant CF made the guarantee agreement with the Defendant’s Intervenor as indicated below (hereinafter “instant guarantee agreement”).

The guarantee period of 1:62,394, 280 on August 25, 2015 to 26.26.25 on August 2018, 2015 to 26.25 on August 26, 2015 to 208.25 on August 26, 2017, 208 to 26.26: 28,376, 640 on May 26, 2018 to 208; 205.6.5 from 208.6.6 to 205.6.6.8, 208, 205 to 208.6.6.6, 208, 205 to 208.6.6, 205, 205 to 208.6.46, 208, 2038, 28.6, 2015 to 25.38