The song was written by Shellie Poole and Graeme Pleeth; adapted by Belinda and Mauri Stern; produced by Mauri Stern and Graeme Pleeth. Was an enormous success in Mexico and an international success for Belinda.
In the video, Belinda has visions of the boyfriend dying in a car crash. The song asks "¿Cuándo se va a terminar o cuándo se hará realidad?" meaning "When is it going to be over or when is it going to be reality?". She states that her boyfriend is her 'Ángel'. The actor who portrayed the boyfriend, Eddy Vilard, is friends with Belinda in real life.
The music video was directed by Mexican video director Alejandro Lozano, and was premiered in January, 2004 on MTV Latino.