The sole source of the premier's power is the president, so the premier has to pretty much take orders. That is why a single phone call from a confidant of the former president, or from his son-in-law, is all it took to get cabinet members to toe the line. The system is almost totally lacking in rules. There's no clear mechanism for the exercise of presidential power.
而行政院長唯一的權力來源就是總統，因此必須對總統言聽計從，這也就是為什麼之前的總統親信或女婿一通電話，就可以讓部會首長乖乖聽命、體制規範幾乎蕩然的原因。