The protagonist Pu Feifan is an orphan. When he was six years old, he traveled to a seemingly normal "parallel world" and lived in a warm family of five. However, when he was eighteen years old, he accidentally discovered the truth about this world: this is not a parallel world, but a mysterious realm. Almost all of his relatives and friends are terrible "beasts", and the proportion of real humans is only one ten thousandth. Once humans notice anomalies in the world and reveal their identity, they will be hunted by beasts.
