Espers–individuals who possess extraordinary power, with the price that every use brings them closer to the brink of madness. Guides–those who can stabilize the inner turmoil an Esper’s power creates. In a world ravaged by war, Wonwoo is a soldier and awakened Guide known as a ‘Purifier’. After losing all his comrades, he is suddenly pulled into a parallel world through a thick and mysterious fog. It's there that Wonwoo encounters a dying version of himself, and given the opportunity to continue life as his counterpart in this other world. "Please, don’t live a life made meaningless by regret…" He is astonished to find that, in this new world, all his comrades who were once dead are still alive. Wonwoo resolves to find them and use his abilities to help them—and in so doing, crosses paths with Gye Yoon, the ruler of the North. "It’s because of those eyes. Those exact, same eyes." For some reason, every time Wonwoo looks at Gye Yoon… someone else comes to mind…