an interest in her blank blue eyes and uses his authority to make her the floor master of B1. Ray's floor is modelled after her house and is filled with many deadly traps with the exception of her bedroom and living room where the stitched corpse of her parents is placed. / The 20-year-old male protagonist of the story. Once an infamous serial killer, he is now the floor master of B6. He is noticeable for his body being completed covered in bandages and wields a grim-reaper-like scythe. Bloodthirsty, Zack delights in destroying the happiness of his victims and filling them with despair. As Ray showed a severe lack in emotions, he found no interest in killing her and let her stay alive for him to use her intelligence to escape the building, in return that he will kill her once they escape. Zack grew up only knowing how to kill due to being treated abusively as a child. Abandoned by his parents, his stepfather tried to burn him and his mother to death, wounding his body with burns that he covered up with bandages and causing him to develop an intense fear of fire. His mother then left him in the care of an illegal orphanage that trafficked children, where he faced subsequently more abusive treatment, becoming a tool of labour. Upon watching a slasher horror movie left by the head of the orphanage, Zack was inspired to go on a murder spree, with the heads of the orphanage being his first victims. He is subsequently found by Gray and became a floor master. His floor is modelled after a deserted, dirty network of alleyways. Supporting characters / A counsellor who has an insane obsession with eyes, especially Ray's blank, blue ones. Due to being born without a right eye, he was bullied for most of his childhood. His missing eye also caused fights between his parents until they divorced and his mother committed suicide. From there, Danny began to find blank, dead eyes like his mother's beautiful, becoming a counsellor to search for eyes that could satisfy him. Prior to the series, he was a counsellor for prisoners and met Gray, who offered him the chance to become the floor master of B5. Believing it could satisfy him, Danny took on the offer and subsequently used his authority to bring Ray into Gray's experiment and make her the