Therefore, the defendant is obligated to pay to the plaintiff 200,000,000 won for the damages under the contract cancellation and the damages for delay at the rate of 15% per annum as requested by the plaintiff from November 11, 2015 to the date of the delivery of a copy of the complaint of this case as the date of the cancellation of the contract, as requested by the plaintiff. Thus, the plaintiff's claim of this case seeking such payment is justified within the scope of the above recognition, and the remaining claims are dismissed for lack of reason (the statutory interest rate of Article 3 (1) of the Act on Special Cases Concerning the Promotion, etc. of Legal Proceedings is partially dismissed as amended by Presidential Decree No. 26553, Sept. 25, 2015, which is partially dismissed as it is without the designation of the date of pleading notwithstanding partial dismissal). It is decided as per Disposition by the application of the proviso of Article 98 and the proviso of Article 101 of the Civil Procedure Act.