744 A.D., Chang'an, the Tang Empire's capital on the eve of the Lantern Festival. Intelligence chief Li Bi has twelve hours — one full day in the Chinese reckoning of twelve two-hour periods — to prevent a terrorist attack that could bring down the most cosmopolitan city in the medieval world. With no legitimate options remaining, he pardons death-row inmate Zhang Xiao Jing, a former war hero turned fugitive, and sends him into the city's labyrinthine streets to find the conspirators before the lanterns are lit. The Longest Day in Chang'an is C-drama's closest equivalent to 24 — a real-time thriller that uses its historical setting not as costume but as architecture, building a Tang dynasty so detailed and alive that the stakes feel proportional to the world being protected.
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