Xin Caocao travels through time to the Great Song Dynasty with a positioning system and becomes an unloved illegitimate daughter of the Earl's household. Her cruel father and legitimate mother force her to marry Chu Yanling, a young man whom everyone considers foolish. Relying on her special system to gather intelligence and build up her own power, she carefully protects her husband, who is merely pretending to be foolish. Little does she know that Chu Yanling is actually a brilliant and deeply calculating strategist who has been concealing his true abilities and secretly making plans all along. Both hide their real identities while silently protecting each other and fighting their enemies side by side. In the end, they join forces to eliminate corrupt officials and villains, solidify their positions of power, and find sincere love, achieving success in both their careers and their relationship.