In the Cataclysm Era, Xiao Ye, raised with care by elders in the no-man's land since childhood, unexpectedly loses his peaceful country life and heads alone to Black Mansion City to study, carrying a token left by his family. Ahead of him are classmates of all kinds and intricate forces inside the city. With the calm mind honed in the wilderness over the years and a unique opportunity, he struggles to adapt to his brand-new campus life and meets like-minded companions, while tracing clues to his birth and step by step unlocking the secret of his origin, steadily starting a new life in the vast city.