Special forces soldier Jin Quan was betrayed during a mission and turned into a living coordinate to guide a missile. When he woke up again, he found himself as a down-and-out man lying unconscious on the streets of the Lower City — the gathering place of the lowest-class humans in this world, where people exist as expendable mining slaves. At the brink of life and death, Jin Quan awakened the “Demon Swordsman” class, and the radiation from the dirty bomb explosion in his previous life became his innate ability. In this world, Jin Quan will engage in deadly battles against the God’s Chosen.