(1) Where at least two persons jointly apply for trademark registration or request a trial, and follow procedures related to such application or trial, each person shall represent all the persons except in any of the following cases: Provided, That where they have selected their representative and reported their representative to the Commissioner of the Korean Intellectual Property Office or the Chief Judge of the Intellectual Property Trial and Appeal Board, their representative shall represent all such persons:
1. Abandonment or withdrawal of an application for trademark registration;
2. Modification of an application under Article 44;
3. Withdrawal of any of the following applications:(a) An application to register the renewal of the duration;(b) An application for registration of additional designated goods;(c) An application for registration of the conversion of the classification of goods;
4. Withdrawal of an application;
5. Withdrawal of a request;
6. Request for a trial under Article 115 or 116;(2) Where at least two persons report their representative pursuant to the proviso, with the exception of the subparagraphs, of paragraph (1), they shall certify in writing that they have selected their representative.