Rosario is a young student who has been forced by fate to become a hitwoman in the service of León El Güero. It all started after she was raped, and her best friend murdered. In her first taste of revenge, Rosario tricks Cacho, one of her rapists, to meet at her house, and after seducing him, she stabs him with an unusual choice of weapon, a pair of scissors - tijeras. Later, Rosario takes down Gonzalo González "El General" for killing her best friend. For Rosario, "Loving is more difficult than killing," caught in a love triangle with Emilio and Antonio, two friends whose desire for Rosario comes between them. Having committed to each other, Rosario and Antonio finally manage to evade their enemies and are free, but as they flee, they are forced to separate from each other. Rosario is fooled by El Ángel, a mysterious and seductive man who hides a deep secret. Rosario ends up facing a choice between a vengeance brawl with two criminal lords, and protecting Antonio, the love of her life.