Employment Insurance Act Article 31

If a person has other additional income while he/she is unemployed or receiving unemployment benefit, he/she should inform the Public Employment Service Institution when applying for an unemployment certificate or processing unemployment re-certification.
中文原文 就業保險法第31條
失業期間或受領失業給付期間另有其他工作收入者,應於申請失業認定或辦理失業再認定時,告知公立就業服務機構。

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