Xen—an ex-300-year-old CEO thrown out of his company by greedy shareholders that were hellbent on monetizing death—was in the middle of a questionable operation to become immortal through biotech when the system apocalypse arrived. The system saved humanity by taking them off to tutorial realms.  Xen was left behind. So far from human in both mind and body, Xen was identified as a monster and treated like one. Sent into the tutorial realm as a regional boss, he was given his first mission. [40 Earthlings remain alive—either become the hunter or the prey] [Only the strong will survive] [Tutorial ends in 30 days] So began the rise of the superior lifeform.