A nonresident(a person who has neither an address nor a place of business in the Republic of Korea) in accordance with Article 5, Section 1 and 4 of the Patent Act, may not initiate any patent-related procedure such as application, trial, etc., unless he/she is represented by a patent administrator(a patent agent who has an address or a place of business in the Republic of Korea). When a request for a trial is made against he/she, he/she may have problems receiving the copy of the written request for a trial and other documents without a patent administrator, which often brings about difficulties such as the lapse of a right.