Do I need a Korean visa? -Not when passing through Korea.
Will they stamp me when I leave America? -The United States will not stamp anyone who leaves the country. When you check in, the airline staff will put your I-90 (small white card) on the passport page, and then they will give this small white card to the immigration department of the Department of Homeland Security. This is your exit record.
When I returned to China the year before last, the US Customs didn't stamp me, saying that it was normal for me to leave the country without a stamp.
However, I was stamped when I entered China-nonsense, anyone who entered China must be stamped, as well as China citizens and foreign citizens. Unless China citizens use the one-time registered Hong Kong and Macao Pass+multiple endorsements for one year in Hong Kong (Shenzhen household registration), they can use the self-service inspection channel, or Hong Kong and Macao residents use the Home Visit Permit. There is no such thing as stamping.
"You'd better go to the international student department of the school to ask about the situation. It seems that if you have an American visa to go to other countries, you must go through some formalities. " -Will the International Student Department handle this? Other international students, such as Hongkong, Macau, Taiwan Province Province and Japan, all go to Korea without a visa. Who cares about China citizens and students?
"China tourists with valid visas and exit air tickets from the United States, Canada and Japan can stay in South Korea without a visa 15 days"-http://big5chinese. visitkorea.or.kr/cht/GK/GK _ ch _1_ 65438+.