Code of Civil Procedure Article 507-4

Where the court finds the third-party opposition action meritorious, it shall revoke the portion of the original final and binding judgment which is prejudicial to that third party and, if necessary, according to the third party's demand and within the scope of the revoked portion, enter a judgment to amend the original judgment. In cases provided in the preceding paragraph, the original judgment shall still take effect between the parties to the original action, except where the claim of action must be adjudicated jointly with regard to the parties to that original action and the third party who initiated the third-party opposition action.
中文原文 民事訴訟法第507-4條
法院認第三人撤銷之訴為有理由者,應撤銷原確定終局判決對該第三人不利之部分,並依第三人之聲明,於必要時,在撤銷之範圍內為變更原判決之判決。
前項情形,原判決於原當事人間仍不失其效力。
但訴訟標的對於原判決當事人及提起撤銷之訴之第三人必須合一確定者,不在此限。

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