Chen Yiyi was an ordinary working woman who accidentally discovered that she might be the daughter of Chen Cheng, president of the wealthy Chen Group. Chen Cheng demands that she steal the Fu Group's bidding documents before he will acknowledge her as his daughter. To accomplish this, Chen Yiyi applies for a job as a live-in caregiver and nanny for Fu Ran's grandmother. After successfully getting hired, she meets Chen Feifei, the eldest daughter of the Chen family. While working, Chen Yiyi accidentally walks in on Fu Ran taking a shower and worries that she has left a bad impression that could jeopardize her mission. Fu's grandmother is stubborn by nature, but rather than giving in to her whims, Chen Yiyi earns her admiration. Chen Feifei advises Chen Yiyi not to steal the bidding documents, and the two grow as close as sisters.