How do people who have been forgotten by the times choose to "do what they know is impossible". The mountains and rivers of the Western Regions (Yumen, Yangguan, Congling, Tiemenguan, Rehai, Bailongdui) are used to reflect the bloody nature of the Tang people; the suspense reversal is used to lay out the dialectic of "loyalty" and "treason".
It sounds pretty good!