The good go to World One, the bad go to World Two, and the others await God's judgment in World Three. 19-year-old Yoon Cheol never questioned this system... until her sister, Jung, was taken to World Two for an unknown crime. Determined to uncover what that crime was, Cheol ventures to the boundary area between World Two and World Three, which is guarded by God's powerful subordinates. But with no special skills or knowledge of the world beyond her own, can Cheol hope to succeed?