Attorney Regulation Act Article 32

Unless adequately justified by good cause, an attorney having accepted retainer shall not terminate the retainer agreement on his/her part. If the attorney seeks to terminate the retainer agreement, he/she shall notify his/her client by a reasonable period of time, take necessary steps to prevent any damage to the rights and interests of any related parties, and return any portion of the remuneration that is not commensurate with his/her work.
中文原文 律師法第32條
律師接受委任後,非有正當理由,不得片面終止契約;終止契約時,應於相當期間前通知委任人,並採取必要措施防止當事人權益受損,及應返還不相當部分之報酬。

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