Nanotechnology meets martial arts at the Mashin Academy. Yeo-un’s mother may not be one of the High Priest’s six official wives, but his father’s blood still qualifies him for a chance at the position of Minor Priest. Will a mysterious nanomachine injection from a future descendent help Yeo-un in this fierce competition against his powerful half-siblings? After being held in disdain and having his life put in danger, an orphan from the Demonic Cult, Cheon Yeo-Woon, has an unexpected visit from his descendant from the future who inserts a nano machine into Cheon Yeo-Woon’s body, which drastically changes Cheon Yeo-Woon’s life after its activation. The story of Cheon Yeo-Woon’s journey of bypassing the Demonic Cult and rising to become the best martial artist has just begun.