In 4045 AD, after an out-of-control war, humans were displaced and the earth was almost deserted. The sky is dark and the earth is cracking, the flowers have fallen and the grass has withered; the eagle has broken its wings, and the giant bear has lost its arms. When the scorching sun scorches the world, small streams dry up and clear streams dry up; poisonous poison spreads over the ground, all the crops and rice wilt, and no insects or fish grow. As a result, survivors had to move underground, expand from small shelters to cities, and then gradually build societies in order to survive. The society calls this period the "Underground Era." In the underground city, the cruelty of the apocalypse caused some people to give up their sense of morality and guilt... Gradually, the harsh system and oppression from classes made people's lives worse than death. In the 21st year of the Underground Age, sudden changes occurred, the Zerg descended, and the earth became a wasteland. The moment of darkness in the so-called "upper class" has become a new light for people who have been suffering for a long time.
Concept: Human beings are complex in their hearts, and nature gives people more than just vitality.