"Asignatura Pendiente" was released as the third single on August 12, 2003. The song was written by Ricardo Arjona and produced by Tommy Torres, is about the artist's experiences, whatever it may be, not only Ricky Martin, but in the mouth of the Puerto Rican singer. This refers to his beginnings with the famous group Menudo", how success has influenced his life and the nostalgia he feels far from his native Puerto Rico, which also applies to Ricardo Arjona, due to his ex-wife and very good friends of the island. In "Asignatura Pendiente" lovelessness, sacrifice and lived rewards are evidenced. The song has reached number five on the "Billboard" Hot Latin Song and number four on the Latin Pop Songs.