Household Registration Act Article 34

The applicant for divorce registration shall be both parties concerned. However, for divorce through final court decree, court mediation or court settlement, or if the divorce had been effective, the applicant shall be one of the parties concerned.
中文原文 戶籍法第34條
離婚登記,以雙方當事人為申請人。
但經法院裁判離婚確定、調解或和解離婚成立或其他離婚已生效者,得以當事人之一方為申請人。

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