دانش آموزان دبیرستان سونگجین پس از پشت سر گذاشتن تعلیمات نظامی خود، عازم اولین ماموریت خود می شوند و... After spheres from the sky drop to the ground, military training begins for the students to ensure their safety. However, the students find it too demanding and have a difficult time. As students head to the shooting range to learn how to shoot, they