If you have dual nationality, you must apply for K-ETA using the passport you will use to enter Korea. Make sure that the same passport information is used when booking your flight and when going through immigration. K-ETA approval is linked to a specific passport, so using a different one can cause issues upon arrival. Even if both of your passports are eligible for K-ETA, you must choose one and stick to it throughout your trip. If you accidentally apply with the wrong passport, you will need to submit a new application using the correct one. Always check the passport number, name, and country details carefully before submitting your application. Failing to match your passport with the approved K-ETA may result in denied boarding or entry. If you’re unsure which passport to use, consult with the airline or contact K-ETA customer support for guidance. For a smooth and accurate application, experts at ETAPORTAL are ready to assist you every step of the way.