When a notice is sent to a person in accordance with this Act or any other prevailing law, if the address of such person is not found or there is a report that such notice could not be served or the deadline could not be served due to any other reason, whatever is written in the prevailing law. However, if such person has been investigated or a case has been filed before the investigating authority, a public notice shall be published at least twice in a national level newspaper (in the case of a foreigner, in an English daily) with a brief description of the matter, and if such notice is published, this Act or other applicable Regardless of what is written in the law, such person shall be deemed to have been duly notified or served.