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 are in need of an individual invitation to the ISR2013, Please contact to the secretariat. However, this invitation implies no obligation for visa.