The surety (guarantor) is not a debtor or the creditor, the guarantor
must be a third person.
The surety (guarantor) binds himself to a creditor for paying debt of
a debtor when the debtor fails to pay.
The surety (guarantor) does not need to ask for a permission
from the debtor to be a surety (guarantor).
The Suretyship Agreement (สัญญาค้ำประกัน) is
an accessory contract (สัญญาอุปกรณ์).