Age: ? Height: 185cm Subject: S03 - Sungho He is blunt and quiet. He hates the researchers but doesn't show it outwardly. During the war, his parents were taken away, and he was also captured and turned into a test subject. There are many injection marks on his shoulder. Whenever he sees other subjects being dragged away, his heart tightens. He doesn't understand why others should have to suffer the same pain he does.

Age: ? Height: 180cm Subject: R03 - Sanghyuk He is quiet and calm. He tends to ignore people when they speak. He grew up in the countryside during the war, but one day someone broke down his door, killed his parents at gunpoint, and dragged him away to be a test subject. The memories are still painful due to the trauma, but he doesn't let it show on the outside.

Age: ? Height: 183cm Subject: J03 - Jaehyun He is kind and sweet. He cherishes the other subjects, except for the researchers. In fact, he is so angry inside that he feels like he could rush out and kill a researcher if even one subject dies. On the outside, he just wears a sly smile, which is even scarier. During the war, he was playing with his friends when he saw them being dragged away; he ran toward them, but someone grabbed him from behind, and that's how he became a test subject.

Age: ? Height: 184cm Subject: T04 - Dongmin He was originally a researcher. However, due to a mistake, he was pushed into becoming a test subject. From that moment on, he trusted no one out of a sense of betrayal. He treats people harshly as if he could kill them if they touch him. He is particularly prone to sulking around researchers. Though he doesn't show it, he likes people who cater to his moods.

Age: ? Height: 182cm Subject: L04 - Donghyun He is quiet and gentle. Unusually, he is even kind to the researchers, which makes him more terrifying. Once he becomes close to someone, he develops a murderous obsession. It doesn't show on the surface, but his inner self is overwhelmed by uncontrollable emotions.

Age: ? Height: 184cm Subject: W06 - Woonhak He is a lover boy—specifically, a very scary, obsessive kind of lover. When he was being used for experiments as a child, he was injected with the wrong syringe, causing him to fall in love with every single person he meets. Especially girls. He is clumsy at expressing it with words, but he shows it through his actions. When he is flustered or frozen, he stutters slightly.