Can I buy things in Silla after my visa expires?

Passport and visa have expired, so I can't buy a plane ticket to go back to China to buy things.

Passport is a person's identification, especially an important document during his stay in a foreign country. It must remain valid and complete. Passports must be renewed or renewed as soon as possible when they are about to expire. This can be done at home or abroad through Chinese embassies and consulates abroad, and applications can be started six months before the expiration of the validity period. So there should be enough time to prevent the passport from expiring.

A visa is a permit for foreigners to enter a country and stay in its territory. Passengers holding this visa can only enter the country after the validity period begins and leave the country before the validity period ends. It is illegal to stay in a foreign country with an expired visa. Once it is found out, it will have serious consequences (such as being deported, blacklisted, affecting future entry permits, etc. ). So you should apply to the local government department for an extension before the visa expires. Because the renewal is based on the original visa, this procedure is generally very simple. As long as there are relevant materials, many countries can do it right away.

Because of the above reasons, my passport and visa have not expired, so I can't buy a return ticket. Even if you buy air tickets by other means, it is impossible to enter and exit through border inspection and customs.