legal ground
Article 32 of the Trademark Law
The application for trademark registration shall not damage the prior rights of others, nor shall it preempt the registration of trademarks that others have used and have certain influence by unfair means.
Article 33
Within three months from the date of the announcement of preliminary examination and approval, if the prior obligee or interested party thinks that the trademark violates the provisions of Article 13, paragraphs 2 and 3, Article 15, Article 16, paragraph 1, Article 30, Article 31 and Article 32 of this Law, or thinks that it violates the provisions of Article 4, Article 10, Article 11, Article 12 and Article 19, paragraph 4 of this Law, it may lodge a complaint with the trademark owner. If there is no objection at the expiration of the announcement period, the registration shall be approved, a trademark registration certificate shall be issued and an announcement shall be made.