At the Mashin Academy, advanced nanotechnology and martial arts collide in a brutal struggle for power. Cheon Yeo-un, born to one of the High Priest’s unofficial wives, grows up looked down upon and constantly threatened by his influential half-siblings. Although his status is low, the blood of the High Priest still gives him the right to compete for the title of Minor Priest. However, in a world where strength determines survival, Yeo-un stands little chance against rivals backed by powerful families and allies.

Everything changes when a mysterious descendant from the future suddenly appears and injects him with an advanced nanomachine. With this incredible technology enhancing his body, abilities, and learning speed, Yeo-un gains an unexpected opportunity to rise above his enemies. As fierce battles, deadly conspiracies, and ruthless competition unfold within the academy, he begins carving his own path toward power and revenge.