1. The plaintiff (Counterclaim defendant)'s appeal against the principal lawsuit of this case is dismissed.

2. The costs of appeal are assessed against the Plaintiff (Counterclaim Defendant).

1. The court's explanation of this case is the same as the reasons stated in paragraphs (1) and (2) of the judgment of the court of first instance, thereby citing it in accordance with the main sentence of Article 420 of the Civil Procedure Act.

2. As such, the part of the plaintiff's claim for confirmation of the obligation to pay the plaintiff's principal claim is unlawful and dismissed. The plaintiff's remaining principal claim shall be dismissed as it is without merit. The judgment of the court of first instance is just in conclusion, and the plaintiff's appeal is dismissed as it is without merit. It is so decided as per Disposition.