All visitors to the Republic of Korea must have a valid passport and visa. Visitors with roundtrip tickets from countries who have a special agreement with Korea may be exempt from the visa requirement, and can stay in Korea visa-free for periods up to 30 days, or 90 days, depending on the type of agreement between two countries. When uncertain as to the requirement for entry visa to Korea, please contact the Korean embassy or a consulate as early as possible. If you need an individual invitation to the APSU 2018, please contact the Secretariat via e-mail (kps.apus2@gmail.com). However, this invitation implies no obligation for visa.