What visas do Koreans need to apply for when they come to China?

What kind of visa to get, according to the length of his stay in China and so on.

The simplest one is a tourist visa, but the stay time is generally short (of course, the visa can be extended for one month or changed to a business visa F after entry).

An invitation letter is required for a business visa, and then a business visa is applied to enter China at the Korean Embassy in North China. Generally, the first time you apply for a business visa is 1 month, and the visa can be extended after entry. The longest stay of a business visa is 12 months, counting from the entry.

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I hope the above is helpful to you.