Labor Standards Act Article 13

An employer shall not terminate a contract with a worker who is on leave from work pursuant to Article 50 or, is receiving medical treatment pursuant to Article 59, unless the employer cannot continue operating the business due to an act of God, catastrophe or other force majeure and a prior approval has been obtained from the competent authorities.
中文原文 勞動基準法第13條
勞工在第五十條規定之停止工作期間或第五十九條規定之醫療期間,雇主不得終止契約。
但雇主因天災、事變或其他不可抗力致事業不能繼續,經報主管機關核定者,不在此限。

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