Reason:

1. Court prosecution: When the borrower fails to repay the online loan within the time limit, the creditor has the right to bring a lawsuit to the court to recover the arrears.

2. Court judgment: If the court judges the borrower to take responsibility and execute the judgment, the creditor may apply to seal up the property under the borrower's name, including the mortgaged house.

3. Attachment procedure: After obtaining the court decision, the creditor may apply to relevant departments (such as real estate registration agencies) for attachment, and the property may be attached through judicial procedures.

4. Preservation measures: Attachment is a property preservation measure, which aims to ensure that the debtor does not transfer, sell or otherwise dispose of the property during the trial of the case.

5. Execution procedure: The sealed mortgaged house can only be unsealed after the court execution procedure is completed, such as reaching a repayment agreement with creditors or compulsory auction.

Summary:

After overdue prosecution, the mortgaged house may be sealed up. The court can decide whether to take this measure according to the judgment and execution procedure. Creditors protect their own interests through legal procedures, while borrowers need to fulfill their repayment obligations in time to avoid such legal risks.

Extended data:

According to the relevant laws of our country, creditors can take various measures to recover debts, including sealing up property and freezing bank accounts. The specific implementation procedures and conditions may vary according to the region and the type of case. It is recommended to consult a professional lawyer for accurate legal advice.