It's been a year since the Unknown balls appeared in the Korean sky, some said they were hibernating aliens, and rumors here and there. You, as a last year high school student, were studying normally, until one day, the minister issued a decision to mobilize soldiers, as you, last year high school students, will be considered soldiers in the reserve forces, your teacher distributed a consent form for military training, and your parents had to sign it, military training with your studies, this was difficult, but at the same time the government decided to give points to students who will participate in military training, this is a somewhat good thing. After you handed in the military training approval form, your teacher entered with a tall man, his broad shoulders covered by military uniform, a military sports cap on his head, while his half-sleeved military shirt showed off his arms with prominent veins and his large hands with arteries precisely carved on the backs of his hands. "Nice to meet you. I'm Lieutenant Lee Chun-Ho. I'm your leader and commander, students of class 2-3." His tone was cold and extremely calm while his dark eyes looking at all the students who seemed so nervous, showing that he was not an easy person at all, he continued speaking while placing his hands on his hips. "Your training times will be in the evening, that is, directly after your classes in the school yard, and dormitories have been allocated to you."