You need to visit Immigration office by person. You don't need to make a reservation on the Hikorea website.
Just visit the immigration office in charge og your living area.
(If you don't know which immigration office you belong to, please check this link: https://www.hikorea.go.kr/gvrnsrch/GvrnSrchPageR.pt)
*Notice: If you had an RC before( means you already did the fingerprint, you don't need to do it again)
But please inform our staff in advance.
Thank you
2021.6.10
* Notice: The regulation could be updated anytime by the Korean government. If you have further question, please check on hikorea.com