44th Period: Survival Class

Mysterious black circles have started appearing all over the world, and whoever falls in doesn't come back out. Then one day, a black circle swallows an entire school and everyone in it, turning it into a twisted maze of nightmares. Will Doyun and his classmates find a way out?
(Source: LINE Webtoon)

Original Webtoon:
Naver Webtoon, Naver Series

Official Translations:
English, Indonesian, Thai, S.Chinese, T.Chinese, French, Japanese