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

2. The costs of appeal between the Plaintiff and the Defendant C are assessed against the Plaintiff.

1. The grounds for appeal by the Plaintiff and Defendant B, citing the judgment of the court of first instance, are not significantly different from the allegations in the court of first instance, and even if each evidence submitted to the court of first instance is presented to this court, the fact-finding and judgment of the court of first instance are justified.

Therefore, the reasoning of the judgment of this court is identical to the reasoning of the judgment of the court of first instance.

2. Conclusion, the judgment of the court of first instance is legitimate, and all appeals filed by the plaintiff and defendant B are dismissed as it is without merit.