1. All of the plaintiffs' lawsuits of this case are dismissed.

2. The costs of lawsuit are assessed against the plaintiffs.

1. In relation to the registration of the establishment of a mortgage of this case, which was established as a joint collateral with respect to each real estate of this case, the registration of the establishment of a mortgage of this case, ex officio, may recognize the facts that the mortgagee of the establishment of a mortgage of this case is not the defendant but the non-party Korean bank. Thus, seeking the cancellation of the registration of the establishment of a mortgage of this case against the defendant, who is not a mortgagee, is unlawful since it was against the non-party standing.

2. The instant lawsuit is unlawful and thus, it is so decided as per Disposition by the assent of all participating Justices.