1. The defendant's appeal and the plaintiff's incidental appeal are all dismissed.

2. The costs of appeal and the incidental costs of appeal shall be individually considered.

The defendant's grounds for appeal and the plaintiff's grounds for incidental appeal are not significantly different from the allegations in the first instance court, and the fact-finding and decision in the first instance court are justified even if the evidence submitted in the first instance court is presented to this court.

Therefore, this court's judgment is based on the reasoning of the judgment of the court of first instance, and it is accepted by the main text of Article 420 of the Civil Procedure Act.

In conclusion, the plaintiff's claim is reasonable within the scope of recognition of the judgment of the court of first instance which accepted the above claim, and the remaining claims of the plaintiff are without merit, and thus, they shall be dismissed. The judgment of the court of first instance is just in conclusion, and the defendant's appeal and the incidental appeal of the plaintiff are dismissed. It is so decided as per Disposition.