What are the procedures for traveling to Korea and going through customs?

You need an entry card to travel to Korea and go through customs.

To enter Korea, you need to fill out an entry card. The entry card will be available in multiple languages. It doesn't matter if you are not familiar with Korean and English. Just ask the flight attendant or find the China entry card in front of the immigration office.

Outbound boarding process:

The tax refund machine scans the tax refund form+handles check-in and consignment (in parallel, about 30 minutes);

Pass the security check (at least 30 minutes);

Get duty-free goods (queuing for number+queuing for goods, about 20 minutes);

Prepare for boarding.