If you need to make a reservation at the Korea Immigration Office, you can easily schedule one online by visiting their website at https://www.hikorea.go.kr/. Please note that as of today, only online reservations are accepted, and you cannot walk into the immigration office without a reservation. Therefore, planning and scheduling your appointment in advance is important to avoid any inconvenience or delays. The website is user-friendly and provides clear instructions on how to make an appointment, so you should be able to complete the process without any issues. Once you complete the appointment scheduling process, you will receive a confirmation email with your details. Be sure to check your email and keep the confirmation information handy, as it will be required when you arrive at the immigration office for your appointment.