Related notice in Korean.
http://ece.snu.ac.kr/community/notice/academic?bm=v&bbsidx=52667 

If you have not yet taken this ''The Environmental protection and safety Course'', you are required to take this class in the designated period. Keep note that taking safety course is one of eligibilities for QT.
Those who want to apply for QT in Sep. 2022 must take safety course this time.
freshman must take it in the first semester.
I advise you to get some help from one of your Korean labmates since attached manual is in Korea.
apply for it from 5th Aug. to 16th Aug. through the website.
access mysnu website->click 'safe' -> apply for it
(foreign student's class (group E)  : 8/18 , Building 83 Room 404)