In Shazhou during the prosperous Tang dynasty, everyone mocks Zhang Xiao as a prodigal. Alongside his younger sister Zhang Yao, he hosts an unprecedented, desert-shaking grand festival at Crescent Lake, complete with fireworks, lotus lanterns, and widespread celebration. Yet beneath the flourishing jubilee, undercurrents surge as imperial princes from Chang'an and Tibetan forces spy in the dark. With the wind rising in Dunhuang, the siblings enter the game as a massive web spanning the frontier and the imperial court quietly tightens its grip.