Xu Muyan, a girl with a strange life experience, one day when she was 15 years old, the sky suddenly changed and the world ended. Just when she was about to die, her body suddenly floated in mid-air involuntarily. Before she could laugh, she was instantly sucked in by the black hole in the sky and fell into a dark and moist cave. She was also surrounded by ghostly voices. When she figured out these "creatures", she couldn't help but...