"Aún Hay Algo" was released alongside its parent album Nuestro Amor, in September 2005, and later as the record's second single in 18 November.

The band recorded a Portuguese version of the song, titled "Venha de Novo O Amor" (Spa.

The voice of Mexican singer-songwriter Lynda Thomas is heard during the pre-chorus and chorus, and also doing harmonies for Christopher during his solo and for Dulce during the bridge.

The first verse is sung by Dulce María and Alfonso; the former feels that "there's something growing" between her and her lover, while the latter says that they "have a past, that maybe won't happen to us again".

In the second verse, Maite believes that "there's old feelings" between her and her ex-lover, while Christopher acknowledges that they "have a story, that left us in the middle of loneliness".