Code of Civil Procedure Article 374

Where the opposing party either is unknown or cannot be notified prior to the date designated for taking evidence, the court may appoint a special representative for such party for purposes of protecting his/her rights with regard to the evidence-taking.The provisions of the third paragraph to the fifth paragraph inclusive of Article 51 shall apply mutatis mutandis to the special representative provided in the preceding paragraph.
中文原文 民事訴訟法第374條
他造當事人不明或調查證據期日不及通知他造者,法院因保護該當事人關於調查證據之權利,得為選任特別代理人。
第五十一條第三項至第五項之規定,於前項特別代理人準用之。

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