What are the requirements for entry to South Korea?
Entry, Exit and Visa Requirements
You must have a valid U.S. passport to enter Korea. ...
Visa required for all other purposes, including employment, teaching English, and for stays longer than 90 days.
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Please be informed that you need K-ETA approval before boarding the flight or ship bound for the Republic of Korea. You can apply for K-ETA via the K-ETA official website (www.k-eta.go.kr) or mobile App (K-ETA).