Nano Machine, 1

Cheon Yeowoon's mother may not be one of the High Priest's six official wives, but his father's bloodline still entitles him to the position of Junior Priest. However, becoming a legitimate candidate means facing a ruthless power struggle against his own brothers. Considered weak and lacking support within the demonic hierarchy, Yeowoon seems destined to fail in a competition where only the strongest survive. Will a mysterious injection of nanomachines from a future descendant help Yeowoon in this fierce competition against his powerful half-brothers? With a power that defies all logic, the young man will have a unique opportunity to change his destiny and forge his own path in a world ruled by ambition, betrayal, and martial prowess.