Administrative Procedure Act Article 8

All administrative acts shall be performed in good faith and shall be aimed at the protection of the legitimate and reasonable reliance of the people.
中文原文 行政程序法第8條
行政行為,應以誠實信用之方法為之,並應保護人民正當合理之信賴。

English translation for reference only; the Chinese text prevails. Not legal advice.