A story about a young man who sincerely served his country. When I woke up from the dream, I could no longer see my young face and the blue sky. The end of the reincarnation of separation is what I dream about, and you are my obsession after all. How much time will it take to heal the pain of the past? Missing the many years of Chang'an. Lonely at the end of the world, flying flowers fly away. Who owes whom the troubled times?