The telephone number left at the time of loan as an emergency contact means does not mean that you are responsible for any overdue debts of the lender.
The emergency contact is neither a lender nor a guarantor, but in case the lender cannot be contacted, the bank can find the lender through the emergency contact.
Therefore, the emergency contact person has no repayment obligation. If the emergency contact person is required to repay or threatened, he can take legal measures to protect himself.