For D-2-5 Visa applicants who are currently enrolled as an undergraduate student from his/her/their home country.
If you are have a Master's Degree or above, this is not for you.
Please check out one of the below links and print out a screenshot of the webpage, and use it as proof of SNU ranking.
THE: https://www.timeshighereducation.com/world-university-rankings/seoul-national-university
QS: https://www.topuniversities.com/universities/seoul-national-university#p2-rankings