You have mortgaged it to the guarantee company. If you have registered a mortgage loan with the Housing Authority, if you get a mortgage loan from the bank, you can't mortgage it. If the guarantee company does not register the mortgage, you can mortgage in the bank, so even when it is implemented, the bank will have the priority to repay, because if the house stipulated in the guarantee law is mortgaged to more than one person, whoever signs the contract first will have the priority to repay, but if one party registers the mortgage, the registrant will have the priority. Can't say illegal, can only say immoral.