A. On April 26, 2016, the Plaintiff entered into a sales contract with Defendant B Co., Ltd. (hereinafter “Defendant Company”) with the content that the Plaintiff sells the Plaintiff Company for KRW 470,000,000,000 of the price of KRW 15 square meters owned by the Plaintiff (hereinafter “each of the instant land”) out of the 178 square meters of forest land in Sejong Special Self-Governing City (the land category was changed to forest land on September 13, 2018, and the land category was changed to forest land on September 18, 2018) and the F forest land in which the Plaintiff sells the 15 square meters of land owned by the Plaintiff to the Defendant Company for KRW 470,00,00.

The land of this case

G. H. I.dong 8 households each of 8 households shall prepare and transfer a written agreement to sell and purchase all land and buildings at the present time during the construction of a 24-dong multi-household house, at the time of completion of the structural frame.

Provided, That a contract shall be entered into on the premise of the completion of the construction cost, and the aggregate construction cost shall be borne by the seller.

The buyer shall be held responsible for the construction cost incurred after the aggregate construction work.

The method of paying the purchase price: The principal 270,00,000 won, the maximum debt amount, the maximum debt amount of which is currently set up, shall be 351,00,000 won from the time of registration to the buyer.

The total purchase price shall be KRW 650,000,000.

The actual land price is 470,000,000 won, and the actual land price is 180,000,000 won and interest rate after the construction.

KRW 150,000,000 out of the purchase price shall be paid in cash within three months after the contract is concluded.

The balance of KRW 500,000,000 shall be paid for the sale price or loan after completion of the construction.

The balance shall be settled with three-households if it is not available for sale or loan between three months after the completion of the building.

In principle, 10% of the selling price shall be paid at a lower price when the substitute is settled. If the seller wishes to pay in cash after the sale, it shall be sold in cash and paid in cash.

B. In formulating the above sales contract, the Plaintiff and the Defendant Company also prepared “a land and a building sales contract at a newly constructed multi-household housing site” with the following contents.