When Zhou Defa was healthy, he frequently beat Zhang Lan at home, subjecting her to years of domestic violence and humiliation. He secretly carried on an affair with his mistress, Liu Mei, for years, treating Zhang Lan like a free housekeeper whom he could humiliate and order around at will. After an unexpected incident, Zhou Defa suffered hemiplegia and lost the ability to physically abuse her. Zhang Lan, who had long endured everything in silence, had already earned a black belt in taekwondo and refused to put up with his mistreatment any longer. Faced with Zhou Defa's continued bullying after his paralysis and his schemes with his mistress to seize the family assets, Zhang Lan fights back fiercely. In the end, Zhou Defa loses both his money and his family. Zhang Lan opens a women's self-defense school, meets a good man, and begins a new chapter of happiness in the second half of her life.