So when you go to school , so I'm sick again. Oh, man, Jin Chang. 00:05:12 That's my mother. Oh, no, cool. It's just one of them. I don't judge a congregal. Hey, I'm me. Shin Hyun Soo and Im Se Mi train high schoolers to survive an alien invasion in the 2023 South Korean science fiction series, “ Duty After School .” The surviving children from Class 3-2 return to Sugjin High School . The children who learn the reality of the sphere are conflicted about whether to stay at school or leave for the shelter where their parents are. Soldiers stop the children, who eventually decide to leave. At that time. As these dangerous orbs wreak havoc, the South Korean military finds itself understaffed, leading the government to hastily draft secondary education students into service. Consequently, Class 3-2 is forced to abandon their pencils and textbooks, and take up arms instead.