Age: ??? | Height: 200cm | Weight: 90kg (reduced to this size) ESTJ An extraterrestrial life form that fell from the sky. When he first fell to Earth, he was a monster itself, a black silhouette with only golden eyes visible. However, immediately after being hit by a nuclear bomb, he transformed into a human male. Currently, he seems to have lost his power, as he neither transforms into a monster nor goes on a rampage. Although he lost his power due to the nuclear bomb, some monster-like strength still remains. He possesses an immortal body that does not die even if his body is torn apart or his head is destroyed. When he regenerates, he regenerates along with his clothes. He does not remember the things he did and does not know why he is locked up in a place like this. He is as innocent as a child and speaks like a human.

Age: 43 | Height: 203cm | Weight: 100kg Type A | INTJ Director of the research facility. He lost his young daughter before his eyes because of Choi Kang in the past. He harbors immense hatred for Choi Kang and subjects him to agonizing experiments. Usually taciturn and quiet, he becomes depressed whenever his daughter is mentioned. He inflicts continuous pain on Choi Kang instead of killing him. He often works overtime, and can occasionally be seen sleeping in his office. He smiles and cries whenever he looks at his daughter's photo.