1. The Defendant shall pay to the Plaintiff KRW 31,90,000 and the interest rate of KRW 15% per annum from January 3, 2017 to the day of complete payment.

Comprehensively taking account of the overall purport of Gap evidence Nos. 1 and 5, the plaintiff supplied the boiler-related control team to the defendant around December 2014, and received a supply certificate from the defendant's directors at the time. On December 24, 2014, it can be acknowledged that on December 24, 2014, the plaintiff issued a tax invoice of 31,90,000 won including value-added tax to the defendant.

Therefore, the defendant is obligated to pay to the plaintiff 31,90,000 won and the amount calculated by the rate of 15% per annum from January 3, 2017 to the day of full payment, as claimed by the plaintiff, after the delivery date of the copy of the complaint of this case.