1. The Defendants are jointly and severally liable to the Plaintiff for 330,000,000 won and the Defendants B, Defendant D, and Defendant E.

Basic Facts

On March 24, 2014, the Plaintiff entered into a design service contract of G, which is an apartment building and neighborhood living facility (hereinafter “instant building”) to be newly built in Defendant B and Cheongju-si, the representative director of Defendant C (hereinafter “Defendant C”) in the Seoul Special Metropolitan City (hereinafter “instant new site”).

The content of the above design contract was to set up the first floor and the seventh floor above the ground, but thereafter, the number of floors was changed to the 13th floor above the ground before June 2015.

After that, around July 2015, the Plaintiff, Defendant B, and Defendant C drafted a design agreement for the building with the number of floors of the instant building as KRW 15,15, and design cost of KRW 246,169,00, under the ground level.

(C) No. 1; hereinafter “instant design contract” refers to the instant design contract. Meanwhile, on June 1, 2015, the Plaintiff entered into a construction supervision agreement with Defendant B, Defendant C, and the instant building with the term of contract from June 1, 2015 to December 31, 2017, with respect to the new construction of the instant building, with the term of contract from June 1, 2015 to December 31, 2017, with the construction completion of the said building, or with the contract amount of KRW 5,500,00 (including surtax).

(2) On February 18, 2016, Defendant B issued a written confirmation to the Plaintiff on February 18, 2016 (hereinafter “instant supervision agreement”).

He/she confirms the following matters concerning the site of the G construction site in the certification certificate:

1. Design expenses shall be settled after five-month loans;

2.The monthly salary of the consulting engineer permanently stationed in relation to the supervision costs shall be paid by the owner and the supervision costs of the supervision agreement shall be separately paid.

On February 18, 2016, the Plaintiff signed the instant building on April 25, 2016 submitted the design drawings consisting of the 1st underground floor and 15th underground floor. Defendant B and Defendant C received the said design drawings submitted by the Plaintiff on April 26, 2016.

Defendant D., the contractor of the building of this case, Plaintiff B, Defendant C, and the building of this case.