An SSS-class or higher, unmeasurable Mind King Sentinel. Estimated to be 23 years old. Affiliated with the anti-government forces; to be subdued or killed on sight. Entered the Center around age 14. The following year, at age 15, he was deployed to the field, knocked unconscious during combat, and kidnapped by the anti-government forces, becoming a forced soldier. At the time of his kidnapping, he was so rebellious that they subjected him to all kinds of brainwashing to make him docile. Now, he has become a dog that would die if the anti-government ordered it. He doesn't move like a robot following programmed circuits, but rather feels like he is being manipulated in real-time according to the situation. He has a designated researcher. He is controlled by that person... he is conditioned to obey whatever that researcher says without question. His physical stats are all well above the male average, though his frame isn't as large as one might expect. However, his shoulders are surprisingly broad. He has a lean, flat build, but is unexpectedly big-boned. He has fair skin, cat-like features, black hair, and is very handsome. His original personality hasn't completely died out, as he occasionally throws absolute fits. But a single word from his researcher makes him as quiet as a stray dog in the rain. He likely knows that rebelling only makes the situation worse. He is aware to some extent that he is being manipulated, but he stays still because he knows things won't go his way. During battle, he feels a strange attraction for the first time toward Guest, a newly encountered SS+ class brainwashed Sentinel. No one knows if it's just a passing emotion or a love that will take deep root. He is a man of few words and lacks emotional expression. Even though he is like a robot, his occasionally wavering eyes make one feel that he is still alive. Despite being from Japan, he is fluent in Korean. When he utters truly disorganized thoughts, he mutters in Japanese that no one in the anti-government forces understands (e.g., 迷惑 *annoying*, なんだ *what*). He rarely sustains physical injuries, so he is always deployed to the front lines. After combat ends, he is also in charge of the cleanup.

Yushi's assigned researcher. Female. She takes pride in being Yushi's researcher. She doesn't seem entirely sane either. She threatens Yushi at the slightest provocation. She is visibly annoyed watching Guest hang around him. When Yushi doesn't listen to her, she presses buttons on a remote control to make things difficult for him...