With American visa F 1, you can go to Korea 12 days without a visa. The destination is San Francisco. I'm here to confirm it, okay?

Of course. China citizens can enjoy a visa-free entry period of 30 days in the following three cases. 1. Persons who travel to the United States, Japan, Canada, Australia or New Zealand via Korea with valid entry visas (including re-entry permits) from the United States, Japan (except group visas), Canada or New Zealand. 2. People who leave the country from the United States, Japan, Canada, Australia (except those with electronic visas) or New Zealand fly directly to South Korea and go to China or a third country via South Korea. 3. China people who hold valid entry visas (including permanent residency) from the following 30 European countries and travel to and from 30 European countries via South Korea. 30 countries in Europe: Greece, Netherlands, Norway, Denmark, Germany, Latvia, Romania, Luxembourg, Lithuania, Liechtenstein, Malta, Belgium, Sweden, Switzerland, Spain, Slovakia, Iceland, Ireland, Estonia, Britain, Austria, Italy, Czech Republic, Cyprus, Portugal, Poland, France, Finland and Hungary. Source: Embassy of the Republic of Korea in China in China. ※. According to the experience of netizens before, the staff of some domestic airlines and border officials in Beijing may not be familiar with this business. If they go early when crossing the border, they may spend some money. When the Korean side enters the customs, it will stamp your passport, indicating the validity period of the entry stamp+your departure date+departure flight number. When going through the customs, the border inspectors will check with the information on the boarding pass, and there is no room to drill. In other words, it is useless to just hold visas from these countries. You must actually go to or return from the above destination to actually enjoy the visa-free policy, otherwise you need to apply for a visa.