How long does a Korean passport take?
Usually about 8 business days, longer in peak seasons.
This page lists what to do, in order, from getting a Korean passport to departure, with a tool or guide for each step.
It can only be changed later for specific legal reasons.
3.5 × 4.5 cm, head 3.2–3.6 cm, white background, taken within 6 months.
Start from the smallest unit: unit, building number, road, district, city.
U.S. visas use a 2 × 2 inch square photo; China uses 33 × 48 mm.
Usually about 8 business days, longer in peak seasons.