Lupita López is a beautiful young woman who is studying law. Although she has a very promising future, for now she has no money and so she secretly lives in the Sares Rochild department store, where she works by day as a salesperson in the toy department and her uncle works by night as a night watchman. But one day, she meets a boy in the waiting room of the store owner's office. She thinks he is there looking for a job, and Alfredo decides to play along. Using the name of his best friend, Carlos, he pretends to be poor and gets a job in the stores, which belong to his father where nobody knows him, to get closer to Lupita. What started out as a game for Alfredo takes an unexpected turn when he ends up truly falling in love with her.