Duty After School S01 E01 Question the Spheres

For a year, people learn to live with the spheres without suffering any specific changes. Even with the alien-looking spheres floating all over the sky, the CSAT is what matters the most to seniors of Sungjin High School. When the exam is just around the corner, one of the spheres drops on a military camp for the first time, and more shocking news awaits them.