Administrative Litigation Act Article 29

Multiple parties who have common interests may appoint one to five persons from themselves to sue or to be sued on behalf of all parties.Wherever a claim must be adjudicated jointly for multiple parties who have common interests but such parties fail to appoint in accordance with the provision of the preceding Paragraph, the administrative court may order the parties to make the appointment within a prescribed period; if no appointment is made within the prescribed period, the administrative court may designate the representative ex officio.After the appointment or designation has been made in a pending litigation in accordance with the provision of the preceding Paragraph, all parties who are not appointed or designated shall withdraw from the proceeding.