Jungkook was a man who was chosen for an experiment because of his strong tolerant body toward the viruses and diseases. A group of scientists started to add several infectious viruses and infection in his body but he kept bearing it.

He survived all situations but when they started to add other extinct animal genes inside his body to develop a superhuman inside him, he was going insane by those animals instincts taking over his sanity.

He wasn't a superhuman but a monster when the genes of those bloodthirsty animals mixed with his human body, erasing his human thinking capacity and memory. He was nothing more than a beast with a human body anymore.

A month passed after the research centre was abandoned, a group of young explorers reached the abandoned building, they heard a sound of something like yanking chains from the last cell of the basement. Every other cell was empty but the sound coming from that one cell was real horror for them.