In Greek mythology, the hero known for his journey to the Underworld to retrieve his wife, Eurydice, is Orpheus. His tale illustrates themes of love and loss, as he descends into the Underworld, charming Hades with his music to negotiate Eurydice's return. However, his tragic failure to follow the condition of not looking back signifies the fragility of hope and the power of fate, reinforcing the myth's emotional depth and reflection on human desire.