Xu Youyou, who started her own business, hired the nanny Liu Xiuli at a high salary to manage her life, but the other party had no professional boundaries at all, and all day long pointed fingers at her life, consumption, marriage and romance in the tone of an elder, acting just like a "live-in mother-in-law". Seeing that the heroine tolerated her repeatedly because her cooking skills were fair, Liu Xiuli pushed her luck and brought her son Zhao Dayong into the employer's home. The mother and son sang in tune with each other, penetrating step by step with the illusion of being "steady, sensible, gentle and considerate". After accidentally stumbling upon the plot, Xu Youyou remained calm and laid out her plans in secret.