Mercedes actually is the biological mother of Marina. In her youth she became pregnant and was at the mercy of Ernesto Contreras, who snatched her other twin daughter, Magdalena (Ximena Navarrete). Mercedes forged a fortune, with which also gained the respect of those around her and the power to face their enemies. Mercedes has dedicated her life to retrieve his daughters, for this has been that people involved with the underworld of white slavery, becoming "Queen of the Night", whose personality has allowed her to save many young victims.