Constitutional Court Procedure Act Article 53

(Effect of Voidance on Pending Cases before Other Courts) Where the applicable laws are declared void immediately or retroactively, all the cases pending in any court are to be adjudicated in accordance with the ratio decidendi of the judgment of the Constitutional Court.The legal effect of final court decisions, except otherwise statutorily provided, will not be affected by the judgment of the Constitutional Court that declared the applicable law void immediately. The final court decisions where the applicable laws are thereby voided retroactively may be redressed pursuant to legal procedures or the ratio decidendi of the judgment of the Constitutional Court. Where such final court decisions are criminal, the Attorney General shall file an extraordinary appeal.
中文原文 憲法訴訟法第53條
判決宣告法規範立即失效或溯及失效者,於判決前已繫屬於各法院而尚未終結之案件,各法院應依判決意旨為裁判。
判決前適用立即失效之法規範作成之確定裁判,其效力除法律另有規定外,不受影響。
判決前以溯及失效之法規範為基礎作成之確定裁判,得依法定程序或判決意旨救濟之;其為刑事確定裁判者,檢察總長得據以提起非常上訴。

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