What will happen if the direct selling bank in Bank of Ningbo is overdue? Will the principal be repaid?

Yes, but you need to pay a high penalty interest and liquidated damages.

If it is three days overdue, then the credit record has not been uploaded, and you can repay it as soon as possible. Different financial institutions have different definitions of short-term overdue time. In view of short-term overdue, institutions generally do not take compulsory measures, but will remind them to collect repayment, which will result in high fines and liquidated damages. After loans overdue, in addition to repaying the interest and principal, you also need to pay a high penalty interest and liquidated damages.