https://overseas.mofa.go.kr/us-losangeles-en/wpge/m_4397/contents.do For Non-U.S. citizen : Tourists in transit (Click) For Non-U.S. citizen(e.g. China, Mongol, Vietnam, Philippine, India, Cambodia, Laos, Bangladesh, Pakistan, Armenia, etc), Tourists in transit to another countries via Korea, can visit Korea without a visa for up to 30 days. This rule does not apply for the nationals of 24 countries(e.g. Syria, Sudan, Iran, Cuba, Afghanistan, Nigeria, Ghana, etc) and who have violated Korean immigration law. Eligible Applicants : A person who hold a visa or Permanent residency of U.S. and have a flight ticket that is scheduled to depart from Korea within 30 days. who go to U.S. in transit via Korea; or who stay in U.S. and take a flight from U.S. to Korea to go to a country of nationality or a third country.
没有问题，曾经走过2次，带上机票带有第三国的签证可以在韩国呆几天呢
如果只是想去韩国旅游，不再去第三国了还得需要签证。
For Non-U.S. citizen(e.g. China, Mongol, Vietnam, Philippine, India, Cambodia, Laos, Bangladesh, Pakistan, Armenia, etc), Tourists in transit to another countries via Korea, can visit Korea without a visa for up to 30 days. This rule does not apply for the nationals of 24 countries(e.g. Syria, Sudan, Iran, Cuba, Afghanistan, Nigeria, Ghana, etc) and who have violated Korean immigration law. Eligible Applicants : A person who hold a visa or Permanent residency of U.S. and have a flight ticket that is scheduled to depart from Korea within 30 days. who go to U.S. in transit via Korea; or who stay in U.S. and take a flight from U.S. to Korea to go to a country of nationality or a third country.