Ten years later, an unknown creature appeared in the world. They could take the form of any human being, but the vitality of this creature was extremely fragile. Any external force that caused injuries to humans would cause them to lose their lives, but their heads and thoughts would not be damaged. The protagonist met a Western restaurant waiter named Lin Haoran by chance. It turned out that he had died long ago. That kind of creature couldn't bear to see his grandmother living alone, so it took on his appearance and lived in his place...