Foreign nationals entering Korea are required to have a valid passport and a Korean visa issued by the Korean embassy or consular offices in their country. However, citizens from many countries are now permitted visa-free entry for a limited period under certain conditions. In order to check whether you are allowed to enter Korea without visa issuance and for other requirements, please contact a Korean embassy or consular office in your country or visit the following websites to confirm.
The 107 countries listed on the website linked below are under a Visa Waiver Agreement with Korea. Depending on nationality and passport type, citizens from these countries can visit Korea with the purpose of tourism without a visa for 30 to 90 days.
Hi Korea www.hikorea.go.kr (Korean, English, Chinese)