In Greek mythology, Echo is a mountain nymph who protects Zeus from his wife Hera's jealousy. However, she is not able to protect herself. Hera curses her to repeat only the last words spoken to her, "echoing" others' words.

Time passes and Echo falls in love with Narcissus.

However, she is only able to echo his words without being able to say how she feels. Hence, she sees Narcissus falling in love with himself instead of with her.