Cheon Yeo-un arrives at the Mashin Academy harboring an extraordinary secret—a futuristic nanomachine implanted by a descendant from tomorrow. His mother's lack of official status among the High Priest's six wives doesn't diminish his claim; his paternal heritage qualifies him to contest for the prestigious Minor Priest rank. Fusing nanotechnology with martial mastery, Yeo-un faces formidable half-siblings in a grueling battle for domination.