 He knows the ending in broad strokes as well as the future of the main characters, and will finish the series with bittersweet elements where not everyone will live happily ever after.Martin hopes to write an ending similar to "The Lord of the Rings" that he felt gave the story a satisfying depth and resonance.On the other hand, Martin noted the challenge to avoid a situation like the finale of the TV series "Lost", which left some fans disappointed by deviating too far from their own theories and desires.