Wang Lu appears to be a white collar female worker, but is actually a thief and liar, along with her boyfriend. She is already sick of this job, but her boyfriend that keeps her going. A little boy finds Wang Lu, and hopes she can pretend to be his mother in front of his sickly grandmother. Wang Lu mysteriously accepts the offer. Her boyfriend thinks it is a great chance to get their hands on the family fortune. Wang Lu cannot bear to take things from the grandmother and her grandson.