A. The plaintiffs are the contractors of "Yong-dong, So-gu, So-gu B Apartment-gu."

B. On October 1, 2008, the Plaintiffs decided to sell the above B Apartment Nos. 312 and 603 (hereinafter “the apartment of this case”) to the Defendant KRW 696,60,000,000 (5% of the parcelling-out price) from the Defendant when entering into a contract, the Plaintiffs divided the down payment of KRW 34,830,000 (60% of the parcelling-out price) from the Defendant into six times and divided the intermediate payment of KRW 417,960,00 (60% of the parcelling-out price) into six times, each of which is 69,660,00 won until May 20, 2010; the remainder of KRW 243,810,000 (35% of the parcelling-out price) from the Defendant; and

(hereinafter “instant sales contract”). C.

Articles 2 and 3 of the instant sales contract include the fact that the Defendant did not pay any balance within three months from the expiry date of the designation period of occupancy designated by the Plaintiffs and thus cancel the said sales contract, it shall vest ten percent of the total value of supply in penalty for breach of contract.

With respect to the interest on loans for the first, second, and third three-time part payments among the six-times of part payments, Gap (Plaintiffs) shall pay for the part preceding the date on which the occupancy is designated, and Eul (Defendant) shall reimburse the interest on loans paid to Gap (Plaintiffs) at the time of occupancy, and the interest accrued from the date on which the occupancy is designated shall be borne by Eul (Defendant).

A (Plaintiffs) shall pay for the interest accrued on three occasions in total, including part payments 4, 5, and 6, up to the day preceding the date of commencement of the designation of occupancy, and the interest accrued from the date of commencement of the designation of occupancy shall be borne by B (Defendant).

At the time of concluding the above sales contract, the Plaintiffs and the Defendant entered into an additional agreement containing the following terms on the apportionment of interest on the intermediate payment loan.

(hereinafter referred to as “instant additional arrangement”). E.

The Defendant paid the down payment to the Plaintiffs pursuant to the instant sales contract, and thereafter, the sum of KRW 417,960,000 [the sum of KRW 278,640,000 for four occasions from the new bank (one minute 69,660,000 for one time) from the financial institutions that concluded an agreement on the part payment loan with the Plaintiffs x six times.