Buying condo with UNCLEAN TITLE

Problem/Goal: I am looking to buy a condo but recently discovered that the seller still has it under BDO Home Loan (the balance remaining is still quite large).

Context: I am worried that after my downpayment is used to settle the loan in BDO - the seller will now have a “CLEAN” title & can refuse the rest of the sale. In essence, I am worried that I’ll lose my downpayment.

I understand that we have a contract. But is this possible & how can I safeguard myself? (ex. Can the bank help protect me by transferring the title directly to my name instead of his?)

Previous Attempts: nervous first time buyer here!