Locum Tenens: a person who temporarily fulfills the duties of another. Emerald is the youngest daughter of the Alejandro's. Bagama't lumaki sa mayamang pamilya ay kailanman hindi naging matigas ang ulo nito. She never caused any problem to her parents, she never asked for anything. She just goes with the flow, ngunit may isang tanong na hindi niya masagot. Why does her mother hate her so much? Amethyst, her sister is promised to marry a prince of their country. But she never wanted to marry at such a young age. She has always dreamt of being an artist, a model to be exact, she choose to ran away. Will Emerald be her substitute just to pursue the promise to the royal family?