Korea Life Admin is written by an employer in Korea who takes foreign workers through these offices in person. That means these guides are written from the queue rather than from a policy document: the forms that get handed back, the questions asked at the window, and the trips that turn out to have been unnecessary. It exists because English guidance on Korean administrative procedure tends to stop at "visit your local immigration office" — which is exactly where the difficulty begins.
This is not a government website. Korea Life Admin is independent and has no affiliation with, endorsement from, or authority delegated by the Ministry of Justice, the Korea Immigration Service, any local government, or any other public body.
This is not legal, tax, or immigration advice. Only the office handling your case can decide it. Where a decision is discretionary, the guides say so and name the office that holds the decision.