Subsequent to being held in hatred and having his life put in harm's way, a vagrant from the Demonic Cult, Cheon Yeo-Woon, has a startling visit from his relative from the future who embeds a nano machine into Cheon Yeo-Woon's body, which radically changes Cheon Yeo-Woon's life after its actuation. The tale of Cheon Yeo-Woon's excursion of bypassing the Demonic Cult and ascending to turn into the best military craftsman has recently started.