1. All appeals filed by the plaintiff and the defendant are dismissed.

2. Of the appeal costs, the part relating to the Plaintiff’s appeal is the Plaintiff.

1. Facts of recognition;

A. On April 23, 2018, the Plaintiff entered into the instant delegation contract with the Defendant on April 23, 2018 (hereinafter “instant delegation contract”) with the Seoul Central District Court C compensation for damages and the instant delegation contract on the defense of and counterclaim against the instant case (hereinafter “instant delegation contract”).

2) The main contents of the instant delegation agreement (No. 1) are as follows.

The bottom part is the part that the defendant stated, and the retainer portion is changed to "5,00,000 won" by reducing the part that the plaintiff stated as "6,60,000 won" in the draft of the delegation contract of this case (Evidence A No. 2 of this case) and the contingent remuneration (the contract stated as "performance remuneration" in the "in the contract," but the contract states as "performance remuneration" but "5% of the successful remuneration" in this article) is changed to "20% of the amount cited as the counterclaim."

The expression scope of the case: On April 26, 2018, the Seoul Central District Court C in the first instance court: The party party to the defense and counterclaim: The amount of DNA remuneration: 5,500,000 won (including value added tax): At the time of commencement: 20% of the performance remuneration: The amount equivalent to 5% of the defense amount in the principal lawsuit and 5% of the cited amount in the counterclaim (additional value added tax): At the end of the relevant instance, the Plaintiff sent a delegation contract (Evidence A No. 1) by e-mail to the Defendant on April 26, 2018. The Plaintiff entered the retainer payment into “5,50,000 won”, and the contingent payment into “amount equivalent to 20% of the cited amount in the counterclaim.”

4) The Defendant received the above e-mail and paid KRW 5,500,000 to the Plaintiff around that time.

B. The progress of the Seoul case 1) D Co., Ltd. (hereinafter “D”) as Seoul Central District Court C (hereinafter “Seoul”) against the Defendant around March 2018, the Defendant “On-line English developed by D.