Duty After School

Students in third grade second class at high school are preparing for their university entrance exams when they discover bizarre alien creatures causing chaos in the sky. Suddenly, an invasion occurs over Earth with heavy casualties. The Korean government announces that all universities and high schools will become reserve forces to support military operations. Confused and without a clear purpose, students now attend the reserve force training organized by Platoon Leader Lee Choon-Ho (Shin Hyun-Soo) and Sergeant Kim Won-Bin (Lee Soon-Won). Despite being strict with discipline, Lee cares deeply for his students. Park Eun-Young (Lim Se-Mi),the homeroom teacher of third grade second class, prioritizes their safety above all else. The situation leaves them bewildered as they were previously focused on their entrance exams but now find themselves caught in a war effort that doesn't align with their original goals.