A story about the life of a girl who got a job as an assistant director of a large cosmetic company. Once in the world of beautiful and rich, the heroine feels uncomfortable, but she is not one of those who run away from challenges. She proves with her diligence that attractive appearance and fashionable clothes are not the main thing in a person. And even her boss begins to see in the main character something more than just a "gray mouse". Adaptation of the Colombian serial format «Yo soy Betty, la fea» («Unattractive Betty»).