0: Prologue

Y/N L/N woke up in a desolated land with no recollection of the past years. The last thing he remembered was being injected with a purple serum on top of a wall and losing sense of reality. With no real goal and a fair amount of knowledge of how he was now a human once again, he decided to make his ways to the walls. As he meets new people inside the walls, will his ideals change? Or will he continue the mission his predecesor needed to complete?