Trobek Ur, healer of the forward party in the raid of the Abyssal Labyrinth, suddenly and mysteriously dies just before their confrontation with the sinister ruler of the maze. However, Ur wakes up to find himself not in the afterlife, but back as Bek Hyung-So, in his bed in modern day Korea!He finds out that even though he had been reborn in the world of Greayknell and had lived an entire life there, only a single night had passed back on Earth. Dazed and confused, he attempts to continue his life again in the modern world, but soon finds out to his astonishment, that he has retained the abilities he had as a healer in the other world! The abilities had all been reverted back to their most basic forms, essentially making him a level one healer again, but their very presence allowed him to view the status and conditions of other people, just as he had been able to back on Greayknell.Astounded by this discovery, Bek attempts to keep up appearances as a normal veterinary student, while trying to figure out what his next course of action should be. However, the seemingly mundane appearance of an injured stray dog at his internship clinic becomes the tip in an iceberg of mystery that encompasses two completely different, but intertwined worlds.