When the Lin family goes bankrupt, the son-favoring parents flee in the middle of the night with their son, locking their seemingly dim-witted five-year-old daughter, Lin Xiaoman, inside a wardrobe and abandoning her. Zhou Guifen, the nanny whose wages have been withheld, may have a sharp tongue, but she has a soft heart. Gritting her teeth, she takes the little girl in as her own. Little do they know that Lin Xiaoman is actually a powerhouse with extraordinary combat skills and an astonishingly high IQ. Pretending to be foolish while concealing her true abilities, she protects her adoptive mother and rises to the top. Years later, her biological parents return in grand style, having become wealthy, accompanied by their scheming goddaughter. They spare no effort in mocking and bullying her. Lin Xiaoman shocks everyone by revealing her dual identities as the province's top science-track exam scorer and an elite hacker, leaving her biased parents drowning in regret.