I got a Korean tourist visa, but I didn't go out. Can I extend it?

If you don't go out, it is in China and China, and you can't apply for an extension.

If you have been to Korea, you can apply for an extension locally. Korean tourist visa, detention period 1 month. After the expiration, you can apply to the local exit-entry administration for a one-month extension. * * * There are two opportunities, and the total time * * * reaches three months. However, after the successful extension application, it will affect the next individual tourist visa application after returning to China.