Who need to apply for K-ETA?
K-eTA is a system which provides business travelers with an electronic travel authorization. This authorization is awarded automatically to the nationals of the 66 Visa Waiver Countries and nationals of 46 designated Visa Free Countries.
Foreign nationals intending to enter South Korea for tourism, visiting relatives, events or meetings, or if they plan to make any sort of business transactions need a K-eTA.
Please refer to Mandatory K-ETA required countries.