In 2250, it has been 40 years since humanity was struck by the full-scale outbreak of various superviruses and superbugs. Ning Na has been forced to live in a house equipped with a negative-pressure system for all 40 years. A supercomputer System and robots take care of every aspect of her life. Her deceased family and friends continue to live by her side as virtual people. The virtual people in the super System are actually dead in the real world, yet it is impossible to tell them apart from the living. To keep humanity from panicking, the super System has disabled access to information about whether virtual people are alive or dead in the real world, since so many people are killed by viruses every day. People like Ning Na, biological humans, live in a completely virtual world while retaining real-world feelings and memories. She wants to find out what became of the children born from the eggs she donated, and whether they are safe. Thus begins a journey of discovery amid an apocalyptic crisis, prompting reflection on humanity's greed, selfish desires, and conscience.
