Synopsis：During the Republican era, a human named Chen Yiren saved a young demon princess, Ye Xiaoxin, who had accidentally gotten lost. To save his ailing sister, her brother Ye Guihan stayed hidden by Chen Yiren’s side—because Chen Yiren was the key ingredient needed for her cure. However, as the three of them spent time together, their relationship evolved from hostility to friendship, and they eventually became a true family.