Despised and constantly facing life-threatening dangers, the orphan Cheon Yeo-Woon of the Demonic Cult receives an unexpected visit from a descendant from the future. This mysterious visitor implants a nano machine into his body, triggering a transformation that alters his fate. With the power of the nano machine, Cheon Yeo-Woon embarks on an extraordinary journey, defying the Demonic Cult and striving to become the greatest martial artist of all time. His legend is just beginning.