You should apply for the K-ETA and get the approval before boarding the flight or ship to the Republic of Korea.
Assessment normally takes 72 hours. However, it can take more than 72 hours due to an unexpected increase of applications, the circumstances of the applicants, etc.

The permitted length of stay in the Republic of Korea varies depending on your nationality.
Please refer to the [Eligible Countries / Applicants] page for details.

You need to prepare a valid passport and e-mail address. Also, a credit or debit card to pay the application fee. If you are applying via PC, you need a photo file to upload your facial image.

Yes. If a national of a K-ETA required country or region does not have a K-ETA, he or she will not be allowed to board the flight or the ship to the Republic of Korea.

K-ETA is for nationals of 67 visa waiver countries and regions and nationals of 45 designated visa-free countries and regions. K-ETA is required for foreign nationals who intend to enter the Republic of Korea for tourism, visiting relatives, participating in events or meetings, and business purposes other than profitable activities.

Korea Electronic Travel Authorization (K-ETA) is an online electronic travel authorization that visa-free foreign visitors need to obtain before entering the Republic of Korea for the purpose of a tour, visiting relatives, participating in events or meetings, or business (excluding profit-making activities).