Humans are like beasts in skins. When all order collapses, some of them reveal their dark side. They fearlessly bully those who are weaker than them, and at the same time are afraid of more powerful ones. After the bad environment changes, human beings become the abandoned and weak ones. People struggling in suffering experience pain, despair and hope.
Two people who are both reborn continue to test each other in a collapsing world. When encountering danger, they always want to protect each other.