1. The defendant's appeal against the plaintiffs and the claim for return of provisional payment and the plaintiff's appeal are all dismissed.

2...

The reasoning for the court's explanation of this case is as stated in the reasoning of the judgment of the court of first instance, except that it considers that there is no evidence to deem that the case was sent, and there is no evidence to prove that the above official document has been served to the plaintiff C,O, and P" as stated in the main sentence of Article 420 of the Civil Procedure Act. Thus, it is acceptable to accept it as it is in accordance with the main sentence of Article 420 of the Civil Procedure Act.

Therefore, the judgment of the court of first instance is just in conclusion, and thus, the defendant's appeal against the plaintiffs and the provisional payment claim based on the premise of the cancellation or modification of the judgment of the court of first instance, and the appeal against the defendant of the plaintiffO is dismissed as it is without merit. It is so decided as per Disposition.