In AD 410, mankind experienced the fourth ice age. Thousands of years of experience mean that humans no longer need to fear natural disasters, and various technologies can help people avoid disasters. But more than ten years later, a sudden rain sounded the alarm for mankind. All the unnatural phenomena that followed were the anger of nature, human behavior, or the origin of another world...
Purpose: to highlight the indifference and selfishness of human nature in the apocalypse, using technology and the protagonist's love as clues to emphasize the feelings between characters