1. The defendant (Counterclaim plaintiff)'s appeal is dismissed.

2. The defendant-Counterclaim plaintiff's counterclaim filed at the trial.

1. The reasons for the acceptance of the judgment of the court of first instance, other than adding "2. Additional Judgment", are the reasons for the judgment of the court of first instance, and thus, they are cited by the main sentence of Article 420 of the Civil Procedure Act.

2. Additional determination

A. (1) A summary of the defense of simultaneous performance (1) The defendant was released from the sales contract of this case, and as such, the plaintiff could not respond to the plaintiff's claim until he pays the down payment amount of KRW 30 million paid by the defendant and interest thereon due to restitution to its original state.

(2) 판단 ㈎ 원고와 피고가 이 사건 제1 매매계약에 따라 2015. 8. 26. 지급한 계약금 3,000만 원을 이 사건 제2 매매계약의 계약금 지급으로 갈음한 사실은 앞서 본 바와 같다.

㈏ 한편 갑 1호증의 기재와 변론 전체의 취지를 종합하면, 이 사건 제2 매매계약서 제6조에 ‘계약당사자는 계약해제에 따른 손해배상을 각각 상대방에게 청구할 수 있으며, 손해배상에 대하여 별도의 약정이 없는 한 계약금은 손해배상의 기준으로 본다’라고 규정되어 있는 사실을 인정할 수 있는바, 이는 손해배상액의 예정으로 봄이 상당하다.

However, it appears that the second sale contract of this case was cancelled due to the Defendant’s fault (the Plaintiff confiscated KRW 30 million as the Defendant’s nonperformance of obligation). Thus, the Defendant cannot seek the return of the down payment due to restitution.

The plaintiff's second defense pointing this out is justified, and the defendant's second defense is not justified.

B. (1) The main point of the counterclaim claim and the main defense is that the defendant of this case's second sale contract was cancelled due to the plaintiff's fault, and the contract deposit of 30 million won, damages equivalent to the contract deposit of 30 million won, and 35,047,540 won, and interest or damages for delay on each of the buildings of this case shall be paid as the counterclaim.