①If some or all of the relevant persons fail to appear on the date of a hearing without legitimate grounds, and, they do not submit written statements or evidence documents or other evidence prescribed in Article 21, paragraph (1), or if some or all of the intervenors fail to appear on the date of a hearing, the presiding official may conclude the hearing without granting those persons another opportunity to state their opinions and submit evidence documents or other evidence.

②In addition to the case prescribed in the preceding paragraph, if some or all of the relevant persons fail to appear on the date of a hearing and do not submit written statements or evidence documents or other evidence prescribed in Article 21, paragraph (1), and when those persons are not expected to appear on a date for the hearing for a considerable period of time, the presiding official may ask them to submit written statements and evidence documents or other evidence by setting a due date, and when the due date arrives, may conclude the hearing.