If you are an international student at the University of Seoul expect to pay double the current tuition rate:

Controversy has arisen over the University of Seoul’s plan to nearly double the tuition fees paid by foreign students starting next year. 

Some students and members of the general public say the sudden hike is unfair and taking advantage of a minority group at the school. However, others say the school’s tuition fees are kept artificially low through subsidies from taxpayers and it is improper to provide such a benefit to foreign students who do not pay taxes.

Korea Times

You can read more at the link, but according to the article students at the University of Seoul have their tuition cut in half with the subsidy from taxpayers. Tuition is roughly $906 a semester with the subsidy meaning international students will pay twice that rate which is still extremely affordable compared to tuition rates in many U.S. universities.