I was referring to the Tax exemption.
For the Record the section of theNew Zealand/Korea double tax agreement which gives this benefit says
Article 21
Professors and teachers
1. A professor or teacher who is or was a resident of a Contracting State immediately before making a visit to the other Contracting State, and who, at the invitation of any university, college, school or other similar educational institution, which is recognised by the competent authority in that other Contracting State, visits that other Contracting State for a period not exceeding two years solely for the purpose of teaching or research or both at such educational institution shall be exempt from tax in that other Contracting State on any remuneration for such teaching or research.
2. The provisions of paragraph 1 shall not apply to income from personal services for research if such research is undertaken primarily for the private benefit of a specific person or persons