1. All appeals filed by the Plaintiff (Counterclaim Defendant) and the Defendant (Counterclaim Plaintiff) are dismissed.

2. The costs of appeal shall be borne respectively by each party.

1. The court's explanation of this case is the same as the reasoning of the judgment of the court of first instance, and thus, citing this as it is in accordance with the main sentence of Article 420 of the Civil Procedure Act.

2. In conclusion, the plaintiff B's main claim is accepted within the scope of the above recognition, and all of the plaintiff A and C's main claim and the defendant's counterclaim are dismissed as it is without merit. The judgment of the court of first instance is just in conclusion, and the plaintiffs and the defendant's appeal are dismissed as it is without merit. It is so decided as per Disposition.