The National Sejong Arboretum's official membership page lists KRW 30,000 for one year for a general member, KRW 15,000 for one year for qualifying local residents, KRW 1,000,000 for lifetime membership and a free one-year inclusive membership for eligible free-admission visitors. Adding a family member to a general membership costs KRW 10,000 per person and requires supporting documents at the institution. Online registration allows an immediately issued mobile membership card, while a physical card must be collected in person rather than shipped. On-site applications issue physical cards only. Shop/café and education discounts vary by membership type. Cards are for the member's own use and cannot be transferred; general and local members are told to request refunds within 30 days of joining.