You need an embassy visa for Cape Verde if you have a South Korean passport
Visa options for Cape Verde
Electronic visitor visa
Travelers need a visa to visit Cape Verde for Business or Tourism. An eVisa is the fastest and easiest way of obtaining a visa for Cape Verde because travelers can submit their application and supporting documents online. Once the application is approved, travelers receive their eVisa confirmation electronically. Travelers who register on the EASE platform pay an airport security fee and a visa for Tourism purposes.