Organization Act of the Department of National Treasury of the Ministry of Finance Article 5

The Department may appoint one director, whose position is classified as assessed appointment on job class 13, and is to oversee overall administrative operations; one to two deputy directors, whose positions are classified as assessed appointment on job class 12, and are to facilitate in carrying out administrative operations.
中文原文 財政部國庫署組織條例第5條
本署置署長一人,職務列簡任第十三職等,綜理署務;副署長一人或二人,職務列簡任第十二職等,襄理署務。

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