Article 753-1
Due to being directors, controllers or other representatives of a juridical person, and agreeing to be the guarantor of the obligation of the juridical person, they are only liable to the obligation of the juridical person occurred within the duration of their offices.

Article 746
The guarantor shall not assert the right specified in the preceding article in any of the following cases:
(1) If the guarantor has waived his rights specified in the preceding article.
(2) If the principal debtor has been declared bankrupt.
(3) If the property of the principal debtor is not sufficient to satisfy the obligation.